Investigate Integration Test Failures

[JoeRobich]

5 integration tests are failing regularly in master and master-vs-deps PRs

CSharpUpgradeProject.CPSProject_GeneralPropertyGroupUpdated - System.InvalidOperationException : Expected a light bulb session to appear.
MSBuildWorkspaceTests.TestParseOptions_CSharp_LanguageVersion_Default - Assert.Equal() Failure\r\nExpected: CSharp8\r\nActual: CSharp7_3

The text "To browse the .NET Framework source code" is no longer part of the quick info text for System.String:

BasicQuickInfo.QuickInfo1 - Assert.Equal() Failure\r\n ↓ (pos 72)\r\nExpected: ···f UTF-16 code units.To browse the .NET Framework source code ···\r\nActual: ···f UTF-16 code units.\r\n ↑ (pos 72)
CSharpQuickInfo.QuickInfo_MetadataDocumentation - Assert.Equal() Failure\r\n ↓ (pos 72)\r\nExpected: ···f UTF-16 code units.To browse the .NET Framework source code ···\r\nActual: ···f UTF-16 code units.\r\n ↑ (pos 72)

For Async completion

BasicIntelliSense.IntelliSenseTriggersOnParenWithBraceCompletionAndCorrectUndoMerging - System.AggregateException : One or more errors occurred.\r\n---- System.InvalidOperationException : Expected exactly one session in the completion list, but found 0

• Skip the affected tests
• Update the tests to passing
• Unskip the tests

[JoeRobich]

Seen in #38298 (Test Log), #38229 (Test Log), #38235 (Test Log)

[CyrusNajmabadi]

Outstanding!