Use low-level COM interfaces for UI automation to avoid caches

Make SWIX builds more dependable

This change will trigger a test failure rather than a test hang.

Merge dev15.7-preview3 to dev15.7.x

Add Make Field Readonly analyzer/code fix

#20630 Cast is redundant on attribute with params fix

Remove suggestion to upgrade to latest language version

Added comments to DeterminePrameter to clarify the handling of named arguments. Added test for cast in named argument.

Added a regression test for #25024

Fixes #23392

The Swix dependency is linked via a "BeforeBuild" target. The targets
file for SWIX unconditionally overrides this target. Hence the
definition must be after.

This should work around the problem with SWIX builds where they fail if
more than one version of the SWIX NuGet package is installed on the
machine.

Export classification type definitions for new classification types

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

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

This change suggested by @jasonmalinowski makes the ClassificationTypeExported test
simpler and more accurate.

Fixes #25716

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.