Forward the current access token for authenticated client requests

[maliming]

HttpContextAbpAccessTokenProvider now forwards the incoming access token whenever the request is authenticated (user or client), instead of only when there is a user, so client_credentials requests no longer fall back to IdentityClients.

[Copilot]

Pull request overview

This PR updates HttpContextAbpAccessTokenProvider to forward the incoming access token for any authenticated request (including client_credentials flows), instead of only forwarding when an ABP “current user” is authenticated—preventing authenticated client requests from falling back to IdentityClients.

Changes:

• Switch access-token forwarding eligibility check from ICurrentUser.IsAuthenticated to HttpContext.User.Identity.IsAuthenticated.
• Add integration tests covering authenticated user, authenticated client (no user), and anonymous request scenarios.
• Introduce a small test authentication handler that exposes an access_token via HttpContext.GetTokenAsync.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
framework/src/Volo.Abp.Http.Client.IdentityModel.Web/Volo/Abp/Http/Client/IdentityModel/Web/HttpContextAbpAccessTokenProvider.cs	Forward token based on HttpContext.User authentication state rather than ICurrentUser.
framework/test/Volo.Abp.Http.Client.IdentityModel.Web.Tests/Volo/Abp/Http/Client/IdentityModel/Web/HttpContextAbpAccessTokenProvider_Tests.cs	Adds coverage for user-authenticated, client-authenticated, and anonymous forwarding behavior.
framework/test/Volo.Abp.Http.Client.IdentityModel.Web.Tests/Volo/Abp/Http/Client/IdentityModel/Web/TestTokenAuthHandler.cs	Adds a test auth handler to supply an access_token via authentication properties.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 49.38%. Comparing base (495e7a2) to head (ee99696).
⚠️ Report is 14 commits behind head on rel-10.5.

Files with missing lines	Patch %	Lines
...tityModel/Web/HttpContextAbpAccessTokenProvider.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           rel-10.5   #25740      +/-   ##
============================================
+ Coverage     49.34%   49.38%   +0.04%     
============================================
  Files          3687     3687              
  Lines        124430   124430              
  Branches       9506     9506              
============================================
+ Hits          61396    61449      +53     
+ Misses        61209    61137      -72     
- Partials       1825     1844      +19     

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