Add dSTS integration tests

[XiaoxinMS2]

• Add 7 comprehensive integration tests for dSTS authority
• Tests cover certificate authentication, token caching, tenant switching, correlation ID, and error handling
• Store dSTS configuration securely in Key Vault (MISE-dSTS-CustomAppConfig)
• Remove hardcoded sensitive information for security
• All tests pass successfully (7/7)

Fixes #

Changes proposed in this request

Testing

Performance impact

Documentation

• All relevant documentation is updated.

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[RyAuld]

public const string AppDsts = "MISE-dSTS-CustomAppConfig"; secret name in wrong format. Should be "MISE-App-DSTS-JSON".

[XiaoxinMS2]

Thank you for your reminder, I would update it

[XiaoxinMS1]

Oh, sorry, the secret name is stored in KV, and I don't have permission to update the name in KV.

[bgavrilMS]

@RyAuld can help you with access to the KV.