Added Locale field to TestSettings

[arpavan]

Description

This PR adds support to Test Engine to recognize test plans that were created in different locales, this wasn't supported so far and any test plan that was written in a different locale that consisted of variations in syntax (e.g., ; for , and , for . in some EU locales) would actually break during parsing and execution. Issue #150 has been reported in this regard, and this PR among other upcoming ones addresses this by adding an enhancement to Test Engine to recognize locales.

Changes in this PR include adding the Locale field to the TestSettings class, adding necessary INFO logs to indicate usage of locale and ERROR logs when unrecognized test is used in the locale field. Unit tests have been updated and a new test has been added to cover this change.

NOTE: Currently there's some weird behavior with unit tests where the tests will pass even if I provide bad test data. However I'm requesting reviews of the overall solution while I'm addressing the unit test. The functionality works accurately when run end to end with real test plan files.

Checklist

• [X] The code change is covered by unit tests. I have added tests that prove my fix is effective or that my feature works
• [X] I have performed end-to-end test locally.
• [X] New and existing unit tests pass locally with my changes
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] I used clear names for everything
• [X] I have performed a self-review of my own code

[NavneetThekkumpat]

Nice work, would be nice if you can make the newly added testplan part of integration test workflow run https://github.com/microsoft/PowerApps-TestEngine/blob/main/.github/workflows/build-test.yml

[arpavan]

Nice work, would be nice if you can make the newly added testplan part of integration test workflow run https://github.com/microsoft/PowerApps-TestEngine/blob/main/.github/workflows/build-test.yml

@NavneetThekkumpat there's already a separate work item that addresses this

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
Microsoft.PowerApps.TestEngine	94%	90%	790	✔
Summary	94% (2146 / 2290)	90% (485 / 538)	790	✔

Minimum allowed line rate is 50%