Merge dev16.0-preview3-vs-deps to dev16.0-vs-deps

Merge dev16.0 to dev16.0-vs-deps

Add TextManager.Interop.16.0.DesignTime as a Private VS Package.

Ensure we write logs xUnit logs and dumps in a place where we will archive them

Merge dev15.9.x to dev16.0

We have two folders we use during a test run: we put our XML result
files in one folder for the Azure DevOps task to specifically catch,
and all other log files in a different folder which we upload as a
generic artifact. We were putting log files in the wrong folder so we
never uploaded them as artifacts.

This appears to be dead, with the watchdog support ultimately being
added to RunTests.exe itself.

Add EditorFeatures.Cocoa IVTs for MonoDevelop

Ensure we don't run off the end of the string when parsing \x1

Compute relative folder information if we aren't given it

Merge dev16.0 to dev16.0-vs-deps

Fixes AddUsingExactMatchBeforeRenameTracking integration test

Merge dev16.0 to dev16.0-vs-deps

Fixes https://github.com/dotnet/roslyn/issues/29172

The code was assuming that there is a " at the end of the string token
which it could use to safely bail. In the case of interpolated strings,
the token is just the stuff up to the next interpolated hole, where
there might not be any marker at all.

Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/746365

Merge dev16.0 to dev16.0-vs-deps

We added a new API IProjectSiteEx.AddFileEx that takes the link metadata
for an item so we don't have to query an IVsHierarchy to figure out
where the file is linked into. If we don't have a link though, we should
compute the relative folder to the project directory and use that.

Fixes https://github.com/dotnet/roslyn/issues/33171

Update ADO config for preview4 snap

Merge master to master-vs-deps

Fix rendering of <see> elements with content

Incorrect IDE0004 "Cast is redundant" when passing enum cast to int as constructor parameter accepting int (#32467)

* Fixed 31963

* Added tests.

* Fix for #25470

* Add comments on setting priority to high

Merge dev16.0-preview3-vs-deps to master-vs-deps

Handle opening/closing of additional files in VS Workspace open file …