Fix up integration tests and make it required in PR validation

[arunchndr]

Starting with Joey to close out his open PRs to evaluate if we need further work here. @Cosifne can help as needed.

[Cosifne]

A couple of things on my list :

1. Navigate test might be flaky (not very flaky) The root reason seems like http://index/?leftProject=Microsoft.VisualStudio.Shell.UI.Internal&leftSymbol=mrcrzs7nl8wa&file=Packages%5CSearch%5CPackage%5CPackageAllInOneSearchButtonPresenter.cs&line=67 This fire and forget task
   (Update: this is fixed using a workaround polling mechanism in this PR Update NavigateTo tests to support AllInOneSearch #64582, it is less flaky now, but ideally we need to talk to platform folks to give us a way to wait on these fire and forget tasks)
2. Timeout. This looks like caused because
   a. https://sourceroslyn.io/#Microsoft.VisualStudio.LanguageServices.IntegrationTests/VisualBasic/BasicWinForms.cs,17
   Some tests here
   
   A mystery that it is saving resx file???
   (Update: fix in Save the resx file after a button is added into the WinForm #64910)

b. Either this test or this
is waiting forever so it caused a timeout.

(This problem is solved #64746)

[JoeRobich]

Will need to investigate why QuickInfo session was being returned as null in Workspace ProjectProperties tests #64672

[JoeRobich]

I asked @jasonmalinowski to look at #64721, but he may not have time for a few days.

[Cosifne]

Closed the issue because Integration tests has a good pass rate now and it is enabled as required again.