- Add verifyIL to a ref struct test to ensure we don't box

- Fix for Extension methods + various extension tests
- Rename NeedsDisposeMethod to NeedsDisposal
- Return pattern dispose method from SemanticModel + tests

- Introduce a new bound node to represent a disposable placeholder
- Run disposal lookup on ref structs and store the result
- Lower the looked up disposal method if found

Fixes #31889

* Add regression test for issue #31439

* Delay constraint checking on field types until after type members are added

* Fix tests

* Fix WithNullability for field type constraint checks

* Use SyntaxTree property instead of TypeSyntax.SyntaxTree

* Fix up more expected diagnostics

* Fixes 659765

* Respond to feedback

* Fix async and cancellation, add bool for polling

* Respond to feedback

* Remove unneeded bool

* Fix first run issue

* Check Suspend and Resume buttons

* Respond to feedback

* Check cancellation token
Co-Authored-By: Nchborl <chborl@users.noreply.github.com>

* Change to SafeContinueWithFromAsync

* Spelling
Co-Authored-By: Nchborl <chborl@users.noreply.github.com>

* Remove first run check

* Refactor OLECMD

* Respond to feedback

* Remove parentheses

Ensure that we always mark an analyzer file reference full path as a

* TryGet the InlineRename UndoState before trying to apply the current state

* Don't attach trivia to nodes that will be removed

* Add tests with comments

report NFW instead of crash when creating formatting rules if encoutered unexpected state

* Supress ERR_ForEachMissingMember (1579) when the type being enumerated is an Error Type
* Improve current unit tests for supress cascading error in foreach, and fix test broken by change.
* Update ForEachLoopBinder.cs
  * change usage of collectionExpr.Type in ForEachLoopBinder to collectionExprType
* changes based on peer review

Remove more private reflection from compiler

Merge dev16.0-preview2 to master

Async-streams: Recognize MoveNextAsync that returns an awaitable

Fix NullReferenceException in LocalRewriter.MakeConversionNode

Merge dev16.0-preview2 to master

Fix regression where renaming a CodeElement didn't update node keys

In a larger refactoring I had commented some code out in
NodeKeyValidation.AddProject. This meant that when we did a refactor
rename of a CodeElement, we wouldn't end up updating node keys for all
the existing CodeElements out there. The expectation is CodeElements
are still valid. Uncommenting the code and bringing it back inline with
the current design makes everything work again.

Fixes dotnet/roslyn#31735.

We were creating them directly, but this meant that there was no
proper way to enumerate all of them since we weren't providing a
ProjectCodeModelFactory. This brings the tests slightly more inline with
"real" Visual Studio.

Fix accessibility issues for extract interface dialog

Fix typo

After more searching it is clear that DotNet is preferred in API
signatures over Dotnet. Easy to see when you look at the reference
source

https://referencesource.microsoft.com/#q=dotnet

Fix UseExpressionBodyHelper.GetDiagnosticLocation for indexer declara…

Merge dev16.0-preview2 to master

* Arcade SDK 1.0.0-beta.19054.11

* Consolidate OptProf scripts

* Use raw IBC data from VSTS drop