Bump MSAL to 4.82.1-preview2 and re-enable Managed Identity CAE tests

[Copilot]

MSAL 4.82.1-preview2 resolves CAE support for Managed Identity flows, unblocking the tests that were skipped under issue #3669.

Changes

• Directory.Build.props — MicrosoftIdentityClientVersion: 4.82.0 → 4.82.1-preview2
• OwinWebApp/Web.config & OwinWebApi/Web.config — Both Microsoft.Identity.Client binding redirects updated to 4.82.1.0
• ManagedIdentityCaeTests.cs — Re-enabled 4 tests:
  • ManagedIdentity_ReturnsBearerHeader
  • ManagedIdentity_WithClaims_HeaderBypassesCache
  • UserAssigned_MI_Caching_and_Claims
  • SystemAssigned_MSI_Forwards_ClientCapabilities_InQuery
• FederatedIdentityCaeTests.cs — Re-enabled ManagedIdentityWithFic_WithClaims_BypassesCache

Original prompt

Update Microsoft.Identity.Client (MSAL) from 4.82.0-preview-1 to 4.82.1-preview2 and re-enable the Managed Identity CAE-related tests that were previously skipped for issue #3669.

Changes Required

1. Bump MSAL package version

   • File: Directory.Build.props
   • Change <MicrosoftIdentityClientVersion> from 4.81.0 to 4.82.1-preview2

2. Update binding redirects to match the new version

   • File: tests/DevApps/aspnet-mvc/OwinWebApp/Web.config
     • Update bindingRedirect for Microsoft.Identity.Client (2 instances) to oldVersion="0.0.0.0-4.82.1.0" and newVersion="4.82.1.0"
   • File: tests/DevApps/aspnet-mvc/OwinWebApi/Web.config
     • Update bindingRedirect for Microsoft.Identity.Client (2 instances) to oldVersion="0.0.0.0-4.82.1.0" and newVersion="4.82.1.0"

3. Re-enable Managed Identity CAE tests (remove Skip for issue 3669)

   • File: tests/Microsoft.Identity.Web.Test/ManagedIdentityCaeTests.cs
     • Remove Skip = "See https://github.com/AzureAD/microsoft-identity-web/issues/3669" from:
       • ManagedIdentity_ReturnsBearerHeader
       • ManagedIdentity_WithClaims_HeaderBypassesCache
       • UserAssigned_MI_Caching_and_Claims
       • SystemAssigned_MSI_Forwards_ClientCapabilities_InQuery
   • File: tests/Microsoft.Identity.Web.Test/FederatedIdentityCaeTests.cs
     • Remove Skip = "See https://github.com/AzureAD/microsoft-identity-web/issues/3669" from ManagedIdentityWithFic_WithClaims_BypassesCache

This updates the MSAL version to 4.82.1-preview2 (which resolves CAE support for Managed Identity flows) and re-enables the previously skipped tests.

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[gladjohn]

cc: @bgavrilMS

MSAL public preview with Probe fix. https://www.nuget.org/packages/Microsoft.Identity.Client/4.82.1-preview2

Used that version and re-enabled IdWeb CAE tests and all looks good. FYI. This was just a test run, will close this PR now and will redo once we release MSAL.