OAuth2 Pushed Authorization Request `request_uri` should not be revalidated during the second authorization request after authentication

[said026]

Describe the bug
The expiration check for request_uri is performed during the second validation after user authentication, which can cause the request to fail if the process takes longer than the expires_in duration. This leads to premature expiration and failed authorization flows.

To Reproduce

1. Initiate an OAuth2 authorization request with a short expires_in (e.g., 30 seconds)
2. Complete user authentication, which takes longer than the expires_in duration (e.g., due to MFA or slow network)
3. The second validation of the request_uri occurs (within OAuth2AuthorizationCodeRequestAuthenticationProvider), and the request is rejected because it appears expired

Expected behavior
The expiration check during the second validation should be skipped or handled differently, so that longer authentication processes do not cause the request to expire prematurely.