We had disabled integration tests in -vs-deps since we were regularly
moving to new Visual Studio APIs and we were waiting to get new imaging
systems setup. Now that things have stabilized and we have new images,
we can use them.

Add names to code refactoring providers which don't have one

* Initial support for GotoDefinition in LINQ query syntax.

* Fixed naming issues.

* Fixed failing tests.

* Added support for Cast<> in from clause. Removed support for degenerated select clause. Reverted changes causing regressions.

* Added support for tokens to distinguish which MethodSymbol to return for a SyntaxNode that binds to more than one method. This adds support for range variable types and orderby.

* Fixed regression. Suppressed quick-info for degenerated query expressions.

* Added quick info tests according to the proposal.

* Added test for GotoDefinition. Moved logic for degenerated clauses to deeper layer.

* Added GotoDefinition for let test.

* Added test for incomplete orderby clause

* Code refactorings (Review feedback).

* PR feedback (nits)

* PR feedback (code comments).

* Revert changes in compiler.

* Revert changes in compiler (2).

* Added test for single from clause with out cast.

* Removed call to GetLanguageService and ValueTuple.Create

* Unify to return default;

* Corrected ISyntaxFactsService.IsQueryKeyword for VB and C#

Cancel pending work on workspace dispose

Move bootstrap phase to use NuPkg files

Add unit test leg on ES image

Number of infrastructure fixes

This adds a unit test leg which runs on a Windows machine with only the
ES language installed. This should help us catch issues that make
contribution difficult for developers who don't run English as their
primary language on Windows.

Change procdump so it captures dumps when a stack overflow exception
occurs. Using the command line outlined here:

https://blogs.msdn.microsoft.com/benjaminperkins/2017/06/28/capture-a-stackoverflowexception-and-make-a-dump-0xc00000fd/

closes #25603

There is now just a `-build` option. The `-buildAll` option was
introduced at the time when our official and normal build had fairly
significant differences. Now the delta is very small. Removing this as
it's no longer relevant.

DevDivInsertionFiles.vbproj is the last project which isn't included in
Roslyn.sln. Included it there and remove the solution that used to drive
it's build.

This change moves the captured xunit standard output file into the
standard log folder.

closes #25602

Merge dev15.6.x to dev15.7.x

Raise WorkspaceChanged with a new SourceText even if we have a new snapshot without changes (#25576)

* Fixed DDRIT failure (#25551)

* made sure we raise workspace changed events even when there is no text change.

this is needed to bring workspace up to date with latest text snapshot after we don't merge 2 text snapshot to 1 source text if content is same.

see this for more detail - https://github.com/dotnet/roslyn/pull/24849

* added comments on why we need to process all text change events

* removed changes empty check. now it is possible to have empty changes.

* remove non-empty from comment since set now can be empty.

Reduce number of stack frames to prevent StackOverflow until we have …