upd for cross-cloud calls and unification of OIDC endpoints/calls

[Bionic711]

Unifies authority derived for authentication and graph calls. Allows for custom authentication while remaining in one of the major clouds (MAC/MAG) enabling easier cross-cloud authentication scenarios to be supported.

[Copilot]

Pull request overview

This PR unifies the resolution of Microsoft Graph endpoints and OIDC authority URLs to better support cross-cloud authentication scenarios. It consolidates previously scattered, environment-specific hardcoded Graph URL logic into centralized helper functions, and introduces new optional env-var overrides (CUSTOM_GRAPH_AUTHORITY_URL_VALUE, CUSTOM_OIDC_METADATA_URL_VALUE) that can be applied independently of the base AZURE_ENVIRONMENT setting.

Changes:

• Adds get_graph_endpoint(), get_graph_base_url(), and get_graph_authority() helper functions in functions_authentication.py to centralize Graph URL resolution, and replaces all previously scattered hardcoded/environment-branched Graph URL construction in route files.
• Adds CUSTOM_GRAPH_AUTHORITY_URL_VALUE and CUSTOM_OIDC_METADATA_URL_VALUE to config.py and extends the AUTHORITY/authority setup block to enable cross-cloud override scenarios.
• Updates example.env to document the new optional Graph override variables, and bumps VERSION to 0.239.004.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
application/single_app/functions_authentication.py	Adds _normalize_authority, get_graph_authority, get_graph_base_url, and get_graph_endpoint helper functions; updates _build_msal_app to accept an authority override; updates get_valid_access_token and get_valid_access_token_for_plugins to use the new Graph authority; refactors get_user_profile_image to use get_graph_endpoint.
application/single_app/config.py	Adds CUSTOM_GRAPH_AUTHORITY_URL_VALUE and CUSTOM_OIDC_METADATA_URL_VALUE env vars; restructures AUTHORITY/authority resolution to handle custom overrides; re-orders WORD_CHUNK_SIZE placement; bumps version.
application/single_app/route_backend_users.py	Replaces environment-branched Graph URL construction with get_graph_endpoint("/users").
application/single_app/route_backend_public_workspaces.py	Replaces environment-branched Graph URL construction with get_graph_endpoint(f"/users/{user_id}").
application/single_app/route_backend_documents.py	Replaces hardcoded public-cloud Graph URL with get_graph_endpoint(f"/users/{oid}").
application/single_app/example.env	Documents the two new optional Graph override env vars.

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