Updated Test Plan Samples to Include Locale

[arpavan]

Description

Updated existing test plan samples to add the locale field corresponding to the test plan's intended locale. Also added one additional test plan, with appropriate comments, to represent decimal syntax (commas for periods).

Checklist

• [N/A] 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.
• [N/A] 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
• [N/A] My changes generate no new warnings
• [X] I used clear names for everything
• [X] I have performed a self-review of my own code

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
Microsoft.PowerApps.TestEngine	93%	89%	800	✔
Summary	93% (2171 / 2330)	89% (490 / 548)	800	✔

Minimum allowed line rate is 50%