This fixes a signing regression caused be #25751. That changed us to
directly call the SWIX build props / targets vs. getting them implicitly
from the microbuild props / targets. One of the behaviors that the
microbuild props / targets had that wasn't accounted for was the signing
of the VSIX after they are constructed. Hence this lead to signing
errors on insertion.

This PR fixes that by making the following changes:

1. Adds SWIX VSIX to SignToolData.json so they are accounted for during
normal batch signing.
1. Moves the SWIX build to the pre-sign portion of our build.
1. Removes the references from VSMAN -> SWIX. These references are there
only to enforce ordering which is unnecessary. Having them remain risks
that building the VSMAN will cause the SWIX to be re-built which could
possibly invalidate signing.

Update PATH to our xcopy CLI

[SQLite] Fix continuous probing for sqlite

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

Add InternalsVisibleTo from Workspaces to Microsoft.Test.Apex.VisualStudio

The static constructor of SQLitePersistentStorage would throw an
exception, which would then get logged by the exception logger.

This changes the following logic:

* The database used to be deleted if e_sqlite was not found.
* The sqlite persistent storage is not used if e_sqlite is not found.
* The database ownership lock is released if any exceptions happen
while trying to instantiate the storage.

Fixes #24042

Extra story:
There is a architectures of e_sqlite not existing for some platforms,
i.e. ARM64. Therefore, in MonoDevelop, it would throw a
TypeInitializationException on trying to initialize the SQLitePersistentStorage.

In this case, what would happen is:
* The persistent storage service would create the lock file.
* It would throw in the static constructor, without having passed
ownership
* Thus, the lock file is created by the service, not held by anyone
specifically
* The exception wasn't accounted for, so the storage file would be
deleted
* We now have a lock file present and no storage created
* Roslyn will keep trying to create the persistent storage on every
subsequent try, ending up in a performance issue caused by continuous
IO on trying to get ownership on the lock file, but it can't take it
because nobody released the old lock

Therefore, shortcircuiting and disabling persistent storage in case the
lib is not found is better.

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.

Preview3 rollup

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.

In the case the CLI was previously downloaded but not yet on `%PATH%` we
need to manually add it there. Not doing it leads to cases where MSBuild
can't find the proper SDK and as a result failing the build.

closes #25649

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