Audit if new APIs added to IFileChangeWatcher.cs were intentionally public or not

[mavasani]

@jasonmalinowski It seems the correctness analyzers leg is failing as you recently added a public API that has no entry in unshipped file:

src/Workspaces/Core/Portable/Workspace/ProjectSystem/IFileChangeWatcher.cs(26,25): error RS0016: (NETCORE_ENGINEERING_TELEMETRY=Build) Symbol 'WatchedDirectory' is not part of the declared public API

Looking at your PR which added this public API: #65701, it seems the public API addition was likely unintentional. I am going to to switch it to an internal type, and feel free to make it public again if that was an intentional change.

EDIT: It seems #65701 added 2 more public interfaces: IFileChangeContext and IWatchedFile. I am not sure if any of them were intentionally made public. I have switched all of them back to internal.

Originally posted by @mavasani in #65737 (comment)

[jasonmalinowski]

None of these were intended to be made public, so thank you this was a very good catch!