fix: updated the documents and resolve the code quality issue

[Dhruvkumar-Microsoft]

Purpose

This pull request primarily contains documentation cleanup and minor code refactoring. The most significant changes are the removal of outdated or unnecessary documentation files, the addition and clarification of deployment parameter documentation, and small code cleanup in test and script files.

Documentation updates and cleanup:

• Removed the docs/ManualAzureDeployment.md guide, which described manual Azure deployment steps, as it is likely outdated or superseded.
• Removed the docs/feature-changelog.md file that tracked high-level features for a past release.
• Added documentation for the AZURE_ENV_DEPLOYMENT_FLAVOR parameter and clarified the table of environment variables in docs/CustomizingAzdParameters.md.
• Minor formatting fix in the environment variables table in docs/CustomizingAzdParameters.md.

Code cleanup:

• Removed an unused json import from infra/scripts/post-provision/upload_team_config.py.
• Cleaned up unused imports in src/tests/backend/common/utils/test_team_utils.py.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
TOTAL	3824	552	85%

report-only-changed-files is enabled. No files were changed during this commit :)

Tests	Skipped	Failures	Errors	Time
834	0 💤	0 ❌	0 🔥	9.995s ⏱️