Fix CPC

Don't block in library code.

Earlier the perf test runner using CPC was broken. This change fixes that.

With this change, we will be running CPC a little different than what we used to.
Earlier, we run CPC for 'n' of iterations and the first iteration should to be a
warmup iteration. Each iteration runs all the tests once.

Now, we run CPC for 'n' iterations for each test and 'n' is defined by each test.
The first iteration is, again, a warmup iteration and the rest are considered for the
metrics calculation. With this model, each iteration will run just one test instead of
running all the tests in an iteration. This helps in making the warmup iteration, a
true warmup iteration.

Minor changes:
Since the test csx returns an object now, the test related information has been
moved to the corresponding test csx files.

Verification abstraction

Revert targets

This reverts commit 76881584.

This reverts commit e6ba0e1b.

This reverts commit 2179c9d6.

Fix assert in DiagnosticAnalyzerDriver to account for suppressed anal…

fix standalone perftests

Call ITextUndoHistoryRegistry.TryGetHistory

.targets files refactoring

Introduce internalBootstrap.csx to bootstrap internal users

Update DSR.PortablePdb to rc2-24008

Update to -rc2-24008

Completion sometimes runs in buffer that haven't been registered for undo
with the editor, causing ITextUndoHistoryRegistry.GetHistory to throw an
exception. Call TryGetHistory to avoid the exception.

Update language feature status.

Fix assert in DiagnosticAnalyzerDriver to account for suppressed analyzers which are not passed to CompilationWithAnalyzers.

Make tests their own first class objects

Format conflicts resolved during rename

Build History - Keep 90 days of logs, 21 days of artifacts

Add netstandard1.1 target to Microsoft.DiaSymReader.PortablePdb.nuspec

Implement code action to complete switch statements on enums

Fixes https://github.com/dotnet/roslyn/issues/6766
Fixes https://github.com/dotnet/roslyn/issues/10322