Fixes #23392

Fix failure to initialize RemoteWorkspace in the out-of-process host

Removing package dependency for Microsoft.VisualStudio.Text.UI.Wpf

Bump prerelease version to beta4

Disable Spanish queue

We have many test failures in this queue, so disabled for now.

Merging `features/custom-fixed` to dev15.7.x

Add tests for the "fixed" features.

Merging recent dev15.7.x to features/custom-fixed

Upgrade to newer Microsoft.VSSDK.BuildTools

This fixes issues where CreatePkgDef needs to get a long command line
longer than the usual Windows limit.

Add a refactoring to convert a common for-loop form to a foreach-statement.

Production code changes to aid with test stabilization