Make VBCSCompiler a non-critical process

* Previous PR comments

* Missing tests from test plan

* Enable unmanaged constraint on local functions

* Clean up

* PR Comments

* More tests

* PR Comments

This designation will allow Visual Studio to kill instances of
VBCSCompiler rather than showing it as blocking update installation.

closes #24610

Account for Mutex ctor throwing

InternalsVisibleTo for the completion test framework

Apply a hang mitigating timeout to WaitForLightBulbSessionAsync

* fixed bug where all documents are added as high priority on solution load.

* add tests

Fixed formatting for 'Use pattern matching code fix'

This changes the compiler server to be resilient in the face of the
Mutex constructor throwing an exception. It's documented as being able
to throw various exceptions but we never accounted for it. Had a real
world case pop up when using certain Docker containers on Linux.

In the case the Mutex ctor throws an exception just fall back to normal
csc / vbc execution. The build will complete just fine here, it just
won't have the performance boost of the compiler server.

closes #24124

Misc infrastructure fixes

* add more info on log

* put more data

Improve diagnostics when tests fail due to an asynchronous operation timeout

The space for archiving dump files is limited in Jenkins. Changing our
time out code to avoid creating dump files that won't be meaningful to
bug investigations.

closes #25793

Added IDiscardOperation to the IOperation API

Fix loc issue on "Manage Specifications" and "Manage styles" dialogs

Increase the UseExportProviderAttribute cleanup timeout to 1 minute

Merge the Spanish Jenkins leg

Use SignTool that supports binary logging

Pass SemanticModel as an argument where it is required

Need to generate a binary log during signing so we can understand why
our builds are failing when new signing is enabled.

Implements targets that calculate PathMap from SourceRoots and provide extension point for Source Link generator

Fix loc failures in IDE

Isolate tests

While it doesn't make sense to still be requesting foreground actions after
cancellation is requested, tracking down all callers of
IForegroundNotificationService to ensure the proper checks are in place can be
tedious. This change treats IForegroundNotificationService as the gatekeeper
for scheduling asynchronous operations, and proactively cancels operations if
requested before adding them to the work queue.

This change ensures that all work added to the work queue after disconnection is
immediately cancelled.

Closes #25805

The getter is 'Enabled' and the setter is 'SetEnabled_OnlyUseExportProviderAttributeCanCall'.

Further work to stabilize the integration test interop layer

Make escape analysis over unexpected nodes to return conservative results