removed API in service hub that internally play with data (options) in workspace rather than solution snapshot.

now, like other features, analyzer uses snapshot of options rather than mutable one from Workspace.

eventually we should only use OptionSet snapshot embeded in solution rather than one in workspace.

exposing workspace directly cause people to depends on data/service analyzer is not supposed to depend on, also, it sometime access mutable data instead of snapshot of it which analyzer is not supposed to use.

this cut the connection, and expose specific info analyzer is allowed to use in IDE case.

TypingHelpDirectiveWorks()   - https://github.com/dotnet/roslyn/issues/19232
WorkspacesNetCore.ProjectReference() -  https://github.com/dotnet/roslyn/issues/19231

Related to #19223

Add arglist test and revert changes to BoundByRefArgumentWithCopyBack as it is never exposed in the operation tree

Fixes #18859

Our Test.cmd script and Microbuild test running got messed up during the
recent SDK change.  A series of conflicts were just merged incorrectly.

Add comments explaining why we use the canonical name and "regular" name to map
hierarchies from Solution Explorer to Roslyn projects.