UserId fix for malformed ID read from auth sessions

[tyaginidhi]

NOTE wil consider moving to jsonwebtoken to directly get ID post sync with vscode auth contact point.

This pull request primarily focuses on modifying how user IDs are extracted from account IDs in the AuthenticationProvider.ts file. The extraction logic has been changed in four different authentication functions. Instead of using pop() to get the last segment of the ID after splitting it by '/', the updated code uses shift() to get the first segment after splitting the ID by either '.' or '/'.

Here are the primary changes:

• src/common/services/AuthenticationProvider.ts - intelligenceAPIAuthentication function: Updated the extraction of userId from session?.account.id by splitting it with a regular expression and using shift() instead of pop().
• src/common/services/AuthenticationProvider.ts - dataverseAuthentication function: Same change as above for userId extraction.
• src/common/services/AuthenticationProvider.ts - graphClientAuthentication function: Updated the userId extraction logic in the telemetry event.
• src/common/services/AuthenticationProvider.ts - bapServiceAuthentication function: Similar change as above for userId extraction in the telemetry event.