Add support for Entra ID v1.0 authorization servers in VSCode MCP Client (#262603)

* Initial plan

* Add v1.0 Entra ID support and optimize MCP discovery for Microsoft endpoints

Co-authored-by: TylerLeonhardt <[email protected]>

* Add tests for v1.0 authorization server support

Co-authored-by: TylerLeonhardt <[email protected]>

* Address code review feedback: remove redundant tests and Microsoft-specific logic

Co-authored-by: TylerLeonhardt <[email protected]>

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Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: TylerLeonhardt <[email protected]>