ci(): add source-map-support for testing

[ShaMan123]

Added source map to errors when testing.
Rollup outputs a build warning that seems a false positive.
https://github.com/evanw/node-source-map-support#source-map-support

See outputs after I inserted an error at src/mixins/canvas_events.mixin.ts:727

## browser
not ok 95 Chrome 105.0 - [4 ms] - fabric.Canvas events mixin: A transform will call mouseup and mousedown on the control
    ---
        actual: >
            null
        stack: >
            Error: bip
                at klass._handleEvent (http://localhost:8080/586986970993100/src/mixins/canvas_events.mixin.ts:727:15)
                at klass.__onMouseUp (http://localhost:8080/586986970993100/src/mixins/canvas_events.mixin.ts:662:12)
                at Object.<anonymous> (http://localhost:8080/586986970993100/test/unit/canvas_events.js:428:12)
                at runTest (http://localhost:8080/node_modules/qunit/qunit/qunit.js:2959:35)
                at Test.run (http://localhost:8080/node_modules/qunit/qunit/qunit.js:2942:9)
                at http://localhost:8080/node_modules/qunit/qunit/qunit.js:3233:16
                at processTaskQueue (http://localhost:8080/node_modules/qunit/qunit/qunit.js:2504:26)
                at http://localhost:8080/node_modules/qunit/qunit/qunit.js:2508:13
        message: >
            Died on test #1: bip
                at Object.test (http://localhost:8080/node_modules/qunit/qunit/qunit.js:3624:5)
                at http://localhost:8080/586986970993100/test/unit/canvas_events.js:407:9
                at http://localhost:8080/586986970993100/test/unit/canvas_events.js:1151:3
        negative: >
            false
        browser log: |
    ...

## node
not ok 217 fabric.Canvas events mixin > mouse:up isClick = true
  ---
  message: |+
    Died on test #1: bip
        at Object.test (C:\Users\DELL\Desktop\DEV\fabric.js\node_modules\qunit\qunit\qunit.js:3624:5)
        at C:\Users\DELL\Desktop\DEV\fabric.js\test\unit\canvas_events.js:296:9
        at Object.<anonymous> (C:\Users\DELL\Desktop\DEV\fabric.js\test\unit\canvas_events.js:1151:3)
        at Module._compile (node:internal/modules/cjs/loader:1103:14)
        at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10)
        at Module.load (node:internal/modules/cjs/loader:981:32)
        at Function.Module._load (node:internal/modules/cjs/loader:822:12)
        at Module.require (node:internal/modules/cjs/loader:1005:19)
  severity: failed
  actual  : null
  expected: undefined
  stack: |
    Error: bip
        at klass._handleEvent (C:\Users\DELL\Desktop\DEV\fabric.js\src\mixins\canvas_events.mixin.ts:727:15)
        at klass.__onMouseUp (C:\Users\DELL\Desktop\DEV\fabric.js\src\mixins\canvas_events.mixin.ts:662:12)
        at Object.<anonymous> (C:\Users\DELL\Desktop\DEV\fabric.js\test\unit\canvas_events.js:303:12)
        at runTest (C:\Users\DELL\Desktop\DEV\fabric.js\node_modules\qunit\qunit\qunit.js:2959:35)
        at Test.run (C:\Users\DELL\Desktop\DEV\fabric.js\node_modules\qunit\qunit\qunit.js:2942:9)
        at C:\Users\DELL\Desktop\DEV\fabric.js\node_modules\qunit\qunit\qunit.js:3233:16
        at processTaskQueue (C:\Users\DELL\Desktop\DEV\fabric.js\node_modules\qunit\qunit\qunit.js:2504:26)
        at C:\Users\DELL\Desktop\DEV\fabric.js\node_modules\qunit\qunit\qunit.js:2508:13
  ...

[github-actions]

Coverage after merging source-map-support into master will be

81.97%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
HEADER.js	56%	48.15%	0%	68.18%	13, 17, 17, 17, 17, 17–18, 21, 21–22, 22, 22, 22, 22–23, 26, 28–29, 86, 86, 86
src
cache.ts	97.06%	90%	100%	100%	43
canvas.class.ts	93.47%	90.29%	94.23%	95.72%	1016, 1016, 1050, 1083–1084, 1112–1113, 1144, 1152, 1261–1262, 1264–1265, 1285–1286, 1415–1416, 1425, 1429, 481–482, 488, 496, 615–616, 664–665, 727–728, 731, 733, 770–772, 805, 810–811, 835–836, 993, 993–994, 997
config.ts	56.82%	11.11%	55.56%	73.08%	133, 140–142, 151–152, 152, 152, 152, 152, 152, 152–154, 156
constants.ts	100%	100%	100%	100%
intersection.class.ts	100%	100%	100%	100%
pattern.class.ts	82.29%	72.50%	100%	87.50%	109, 128, 131, 131, 131–132, 163–164, 169–170, 172–173, 196, 67, 86, 86–87
point.class.ts	100%	100%	100%	100%
shadow.class.ts	95.71%	90%	100%	100%	144, 193, 8
static_canvas.class.ts	88.04%	80.89%	96.59%	90.93%	1080–1081, 1081, 1081–1082, 1200, 1250–1251, 1255, 1288–1289, 1367, 1373, 1377, 1402–1403, 1431–1432, 1464–1465, 1502–1503, 1506, 1508, 1508, 1508, 1508, 1512, 1512, 1512–1514, 1537–1538, 1575–1576, 1579, 1581, 1581, 1581, 1581, 1585, 1585, 1585–1587, 1626, 1626–1627, 1630, 1630–1631, 1683, 1685, 1685, 1685, 1685, 1685–1686, 1689–1690, 1690, 1690–1691, 1694, 1694, 1694, 1697, 1700, 1706, 1708–1709, 1709, 1709, 1712–1713, 1713, 1713, 1716, 266–267, 269–270, 272–273, 286–287, 289–290, 587, 607, 661–664, 777, 777–778, 823, 843–845, 845, 845–846, 848–849
src/brushes
base_brush.class.ts	100%	100%	100%	100%
circle_brush.class.ts	3.03%	0%	0%	4%	104–105, 107, 109–111, 120, 120, 120, 122, 124, 126–128, 130–133, 141, 150, 152, 30, 35–36, 44–48, 52–56, 63–66, 74–77, 79, 87, 87, 87, 87, 87–88, 90, 90, 90–93, 96
pattern_brush.class.ts	5.26%	0%	0%	8.33%	18, 23–26, 28–29, 29, 29–34, 36, 40, 48, 48, 48, 56–58, 58, 58, 65–66, 68–69, 69, 73
pencil_brush.class.ts	91.76%	85.42%	100%	93.46%	122–123, 149, 149–151, 268, 272, 277–278, 73–74, 89–90
spray_brush.class.ts	2.30%	0%	0%	3.08%	105–107, 109–110, 118, 118, 118, 118, 118–119, 121–122, 129–130, 132, 134–138, 147, 151, 151, 151, 157, 157, 157–160, 162–165, 169–170, 172, 174–177, 180, 187–188, 190, 192–193, 195, 202–203, 205–206, 209, 209, 215, 215, 219, 27–28, 30–32, 32, 32–34, 38, 48, 55, 62, 69, 76, 83, 95–97
src/color
color.class.ts	91.58%	84.51%	100%	94.34%	325–326, 330–331, 334–335, 45, 51, 77–78, 78, 80, 80, 80–81, 83–84
color_map.ts	100%	100%	100%	100%
constants.ts	100%	100%	100%	100%
index.ts	100%	100%	100%	100%
util.ts	100%	100%	100%	100%
src/controls
control.class.ts	90.24%	81.48%	86.67%	97.50%	213, 289, 289, 331, 342, 8
controls.actions.ts	76.38%	69.20%	93.75%	80.07%	148, 150, 150, 150, 152, 154, 20, 20, 20, 262–265, 283, 285, 293–294, 296, 296–297, 299–300, 304, 326, 328, 336–337, 339, 339–340, 342–343, 347, 372–373, 375, 377, 383, 387, 387, 387–388, 388, 388, 390, 390, 390–391, 391, 391, 394, 394, 394–395, 395, 395, 422–423, 425, 427, 433, 437, 437, 437–438, 438, 438, 440, 440, 440–441, 441, 441, 444, 444, 444–445, 445, 445, 45, 466–468, 470, 470, 470–471, 474–477, 479, 479, 479–481, 481, 481–483, 485, 485, 485–486, 488, 488, 488–489, 494, 494, 494–495, 497, 499–501, 525–526, 528–530, 571–573, 746, 8
controls.render.ts	84.95%	84.78%	100%	84.44%	17, 20, 30–33, 35–38, 48–49, 66, 69
default_controls.ts	94.12%	50%	100%	100%	115, 83
src/filters
2d_backend.class.ts	96.15%	83.33%	100%	100%	63
WebGLProbe.ts	61.54%	80%	57.14%	54.55%	38–39, 49–53, 66–69, 75
base_filter.class.ts	28.49%	31.82%	36.36%	25.47%	100, 107–111, 111, 111–112, 119–120, 120, 120–123, 138, 154, 164–169, 173–174, 174, 174–177, 177, 177, 177, 177–179, 181, 186–187, 192–196, 241–244, 258, 258, 258–259, 261, 277–279, 279, 279, 279, 279–280, 283, 285–286, 288–289, 291–293, 297–298, 300, 304–306, 310, 314, 334, 334, 334–338, 373, 77, 77,

[asturur]

ok this is great, it updates also the coverage report.