fix: added check if team exist while uploading the team

[Dhruvkumar-Microsoft]

Purpose

This pull request enhances the upload_team_config.py script to prevent uploading team configurations that already exist in the backend, improving data integrity and user feedback. The script now checks for the existence of each team before attempting an upload and provides a clear message if the team is already present.

Team existence check and user feedback:

• Added a check_team_exists function that queries the backend to determine if a team with the given ID already exists, using the provided user principal ID for authentication.
• Updated the main upload loop to use check_team_exists before uploading each file. If the team exists, the script reads the config to get the team name and prints a message indicating the team already exists, skipping the upload.

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

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