fix(auth,windows): complete reauthenticateWithCredential on success

[SelaseKay]

Description

On Windows, User.reauthenticateWithCredential() never completed when the credential was valid. The C++ plugin called User::Reauthenticate(), which returns Future<void>, then left the Pigeon success branch empty (// TODO: wrong return type). Dart's Future stayed pending forever. Invalid credentials still failed normally because only the error branch invoked result.

This switches to User::ReauthenticateAndRetrieveData(), which returns AuthResult, and completes the Pigeon callback the same way as LinkWithCredential / ReauthenticateWithProvider.

The reauthenticateWithCredential() e2e group now runs on Windows. The last case in that group is skipped on Windows and macOS because it exercises signInWithEmailAndPassword, not reauthentication (a test-level skip overrides the group skip). The user-mismatch assertion accepts the Windows C++ SDK message, which omits the trailing period. macOS still skips the rest of the group.

Related Issues

• Fixes 🐛 [firebase_auth] Windows: reauthenticateWithCredential never completes on success #18632

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (melos run analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

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