Fix test CanRenderLargeComponentsWithServerRenderMode

[SteveSandersonMS]

Fixes CanRenderLargeComponentsWithServerRenderMode, which should allow us to unquarantine it (#49975)

The test was mistakenly using Assert.Equal when it should be using Browser.Equal. Also it was mistakenly asserting the same thing twice, instead of asserting two different things - probably just a copy-paste error.

When merged, we can mark #49975 as test-fixed.

[SteveSandersonMS]

@javiercn Thanks for approving.

Not sure if you want to re-review, but I encountered a further test issue in the CI run (build log):

Microsoft.AspNetCore.Components.E2ETests.ServerRenderingTests.FormHandlingTests.FormWithParentBindingContextTest.CanBindToFormWithFiles
Assert.Throws() Failure
Expected: typeof(OpenQA.Selenium.StaleElementReferenceException)
Actual:   typeof(OpenQA.Selenium.WebDriverException): unknown error: unhandled inspector error: {"code":-32000,"message":"Node with given id does not belong to the document"}
            (Session info: chrome=122.0.6261.69)
---- OpenQA.Selenium.WebDriverException : unknown error: unhandled inspector error: {"code":-32000,"message":"Node with given id does not belong to the document"}
  (Session info: chrome=122.0.6261.69)

... so I've added a bunch more code to deal with that everywhere throughout the whole E2E test suite. It's probably pretty rare (I haven't seen it before, unless it's just been introduced by some version update), and arguably it could be handled in a separate PR but I think we just want to squash flakiness as quickly as possible.

[javiercn]

@SteveSandersonMS were you able to reproduce the flakyness locally? It would be good to have confirmation that the fixes fix the problem, but I understand testing it locally is hard, so I'm happy to merge this and see.

[SteveSandersonMS]

were you able to reproduce the flakyness locally?

Unfortunately not - I got the StaleElementReferenceException when running locally, not the WebDriverException with the special message that occurred one time in CI.

[amcasey]

Not sure if you want to re-review, but I encountered a further test issue in the CI run (build log):

Microsoft.AspNetCore.Components.E2ETests.ServerRenderingTests.FormHandlingTests.FormWithParentBindingContextTest.CanBindToFormWithFiles
Assert.Throws() Failure
Expected: typeof(OpenQA.Selenium.StaleElementReferenceException)
Actual:   typeof(OpenQA.Selenium.WebDriverException): unknown error: unhandled inspector error: 

We saw this again in https://dev.azure.com/dnceng-public/public/_build/results?buildId=595165&view=results. #54411 hit it too, but I'm not sure how to grab the build URL now that the check has been re-run.