Move SCALE_MATRIX into CanvasGraphics and initialize its DOMMatrix lazily (issue 21720)

[Snuffleupagus]

While this shouldn't affect performance negatively, it does however (ever so slightly) increase the bundle size of the Firefox PDF Viewer.
If that's not desirable, since it's only needed in order to improve Node.js compatibility, we could also just WONTFIX the issue.

[calixteman]

LGTM. Thank you.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.05%. Comparing base (1b4055e) to head (ac5aa27).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21721      +/-   ##
==========================================
+ Coverage   90.02%   90.05%   +0.02%     
==========================================
  Files         264      264              
  Lines       66937    66938       +1     
==========================================
+ Hits        60262    60278      +16     
+ Misses       6675     6660      -15     

Flag	Coverage Δ
browsertest	66.48% <100.00%> (+<0.01%)	⬆️
fonttest	9.03% <ø> (ø)
integrationtest	69.36% <100.00%> (+0.02%)	⬆️
unittest	57.96% <50.00%> (-0.01%)	⬇️
unittestcli	56.72% <50.00%> (+0.01%)	⬆️

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[Snuffleupagus]

/botio browsertest

[moz-tools-bot]

From: Bot.io (Linux m4)

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Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/e8f8c81b0e15623/output.txt

[moz-tools-bot]

From: Bot.io (Windows)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/29fa3e4d9962487/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

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Success

Full output at http://54.241.84.105:8877/e8f8c81b0e15623/output.txt

Total script time: 16.56 mins

• Regression tests: Passed

[moz-tools-bot]

From: Bot.io (Windows)

---

Success

Full output at http://54.193.163.58:8877/29fa3e4d9962487/output.txt

Total script time: 23.35 mins

• Regression tests: Passed