[release/8.0] Use wait assert in flaky tests

[ilonatommy]

• Backport of Unquarantine RadioButtonGetsResetAfterSubmittingEnhancedForm #63556

It was done to main branch as well. The pass rate without this PR is 20%. This PR checks if just backporting the assert fix is enough or was there a bigger framework fix between ne9 and ne8. After 6 runs the failure was not reproduced. If it's not fully fixed then at least it significantly improved the pass rate.

• Fixes [release/net8] Quarantine NavigationManagerUriGetsUpdatedOnEnhancedNavigation_BothServerAndWebAssembly( #61143.

It used to have 0% pass rate before this PR. With the fix, it did not fail yet.

• Quarantine test that fails on every run and is not related to the changes in this PR: [release/8.0] Quarantine CanSendAndReceiveUserMessagesUserNameWithPatternIsTreatedAsLiteral #63582.

[ilonatommy]

1st attempt: it did not fail but we are hitting #61143, that might get fixed by #63564. In the meantime, rerunning.

[ilonatommy]

2nd attempt: fine but NavigationManagerUriGetsUpdatedOnEnhancedNavigation_BothServerAndWebAssembly is still failing and at the same time, RadioButtonGetsResetAfterSubmittingEnhancedForm is failing on the PR that tries to fix NavigationManagerUriGetsUpdatedOnEnhancedNavigation_BothServerAndWebAssembly. I will merge both fixes and run them a bit few more times on the same CI.

[ilonatommy]

/azp run

(3rd attempt: fine)

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[Copilot]

Pull Request Overview

This PR backports a fix for flaky end-to-end tests by replacing immediate Assert calls with WaitAssert and Browser.True() methods to handle timing issues in web UI interactions. The changes specifically target tests that were experiencing low pass rates (20% and 0%) due to race conditions between UI state changes and assertions.

Key changes:

• Replace immediate assertions with wait-based assertions in form handling tests
• Update navigation tests to use browser-specific assertion methods with proper timing

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
FormWithParentBindingContextTest.cs	Converts Assert.True/False calls to WaitAssert.True/False for radio button and checkbox state verification
EnhancedNavigationTest.cs	Replaces Assert.EndsWith with Browser.True() for URI validation with proper wait handling

[ilonatommy]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[ilonatommy]

Not related tests in aspnetcore-ci are failing consequently with #63582.