Remove Msapp Conversion code

[NavneetThekkumpat]

Pull Request Template

Description

• Removed the test conversion code. PR referred for the code removed https://github.com/microsoft/PowerApps-TestEngine/pull/66/files
• Updated the readme

Checklist

• [x] I have performed end-to-end test locally.
• [x] New and existing unit tests pass locally with my changes
• [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

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
Microsoft.PowerApps.TestEngine	94%	91%	773	✔
Summary	94% (2048 / 2175)	91% (479 / 526)	773	✔

Minimum allowed line rate is 50%