Pipeline refactor and publishing the nuget package

[NavneetThekkumpat]

Description

Pipeline refactoring and publishing the nuget package. Internal feed is referenced/fetched from the azure pipeline.

Checklist

• [x] Existing unit tests pass locally with my changes
• [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	91%	88%	817	✔
Summary	91% (2163 / 2384)	88% (497 / 562)	817	✔

Minimum allowed line rate is 50%