Make obsolete TestHelper.Utils.ScreenshotHelper class

[nowsprinting]

• Make obsolete TestHelper.Utils.ScreenshotHelper class
• Fix tests
• Fix TakeScreenshotAttribute tests

[github-actions]

Code Metrics Report

	master (956a337)	#43 (b33d9d9)	+/-
Coverage	62.6%	61.5%	-1.1%
Code to Test Ratio	1:1.9	1:1.9	-0.1
Test Execution Time	3m8s	4m43s	+1m35s

Details

  |                     | master (956a337) | #43 (b33d9d9) |  +/-   |
  |---------------------|------------------|---------------|--------|
- | Coverage            |            62.6% |         61.5% |  -1.1% |
  |   Files             |               23 |            23 |      0 |
  |   Lines             |              527 |           530 |     +3 |
- |   Covered           |              330 |           326 |     -4 |
- | Code to Test Ratio  |            1:1.9 |         1:1.9 |   -0.1 |
  |   Code              |              542 |           543 |     +1 |
- |   Test              |             1042 |          1010 |    -32 |
- | Test Execution Time |             3m8s |         4m43s | +1m35s |

Code coverage of files in pull request scope (91.3% → 81.9%)

Files	Coverage	+/-
Runtime/Attributes/TakeScreenshotAttribute.cs	100.0%	0.0%
Runtime/Utils/ScreenshotHelper.cs	0.0%	-100.0%
RuntimeInternals/ScreenshotHelper.cs	92.1%	+9.2%

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Reported by octocov