test: Run analyzer/source gen tests in parallel

[Youssef1313]

GitHub Issue (If applicable): closes #

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What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

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Please check if your PR fulfills the following requirements:

• Docs have been added/updated which fit documentation template (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Validated PR Screenshots Compare Test Run results.
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Internal Issue (If applicable):

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[Youssef1313]

UWP before (total 53 sec):

Passed!  - Failed:     0, Passed:   103, Skipped:     0, Total:   103, Duration: 713 ms
Passed! - Failed: 0, Passed: 3934, Skipped: 17, Total: 3951, Duration: 27s 502ms
Passed!  - Failed:     0, Passed:    42, Skipped:     0, Total:    42, Duration: 50 s

UWP after (total 47 sec):

Passed!  - Failed:     0, Passed:   103, Skipped:     0, Total:   103, Duration: 552 ms
Passed! - Failed: 0, Passed: 3934, Skipped: 17, Total: 3951, Duration: 27s 605ms
Passed!  - Failed:     0, Passed:    42, Skipped:     0, Total:    42, Duration: 43 s

---

WinUI before (total 1m 40 sec):

Passed! - Failed: 0, Passed: 3934, Skipped: 17, Total: 3951, Duration: 27s 649ms
Passed!  - Failed:     0, Passed:    42, Skipped:     0, Total:    42, Duration: 42 s
Passed!  - Failed:     0, Passed:   160, Skipped:     1, Total:   161, Duration: 1 m 47 s

WinUI after (total 1m 58 sec):

Passed! - Failed: 0, Passed: 3934, Skipped: 17, Total: 3951, Duration: 28s 949ms
Passed!  - Failed:     0, Passed:    42, Skipped:     0, Total:    42, Duration: 1 m
Passed!  - Failed:     0, Passed:   160, Skipped:     1, Total:   161, Duration: 1 m 55 s

That's interesting. It's somehow faster for one job but not the other. Not sure yet if these results will be consistent across multiple runs though.