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.

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.

The intent was to create a debug and release leg for our CoreClr tests.
Our groovy code though gave both jobs the same name and Jenkins let the
last one win. Hence we've only ever been running release CoreClr legs.

This changes the definition to give each a separate name.

This is necessary to install pre-release .debs of the Mono runtime.

This PR fixes the CoreCLR compiler server on Windows and changes our bootstrap 
build to act as a test case. The build was previously failing during pipe ownership verification
because the required API was not available through reflection. This change
uses the System.IO.Pipes.AccessControl API to do pipe ownership verification
instead. However, System.IO.Pipes.AccessControl is operating system dependent 
and thus ends up in the runtimes subdirectory next to the build task.
Unfortunately, there is no mechanism for automatic assembly resolution
of plugin DLLs like MSBuild tasks, so we have to implement something
similar ourselves. This change hooks assembly resolution and, when we
see a well-known DLL request, we redirect it to the appropriate path.

Fixes #20900 and #24072

The tests are dependent on 15.5 but this branch has been updated to 15.6 so the tests are now failing.  Removing until they are fixed.

This just moves the perf-correctness leg to match the machine label of the rest
of our VS jobs.

Newer versions of git (I've seen this behavior on 2.13.1.windows.1 and
have not seen it on 2.11.1.windows.1) are much slower at writing out local
copies of refs after a fetch. Given that we fetch about 10K refs when
running each PR job this can lead to a massive slowdown in fetch times (on
the roslyn integration job, which has a newer version of git on the
workers compared to the other machines, we see fetch taking ~20 mins).

This changes all the Roslyn jobs to fetch just the PR they are going to
test, which speeds up the fetch significantly.

This reverts commit 2fba37a6.

This reverts commit 2fba37a6.

Looks like there is still fall out from the licensing issue.  VS integration tests still failing
at 100% due to a timeout issue.  Change them to not run by default while we look into this.

Can still be run manually for testing with

test vsintegration please

This means you can write a comment and then do the line by itself in
one GitHub comment. Otherwise it's requiring you have exactly one
per comment which is annoying.

Makes two changes to our groovy arguments

1. Prefer - over / which will let us remove our hacky argument change
legacy script.
1. Use the positive -testDesktop over -skipCoreClr verbs

The build depends on a global tool corflags to complete.  Unblocking build for now.

This needs to be done before the merge from master so that we can properly verify the infrastructure changes.