Change CommandInfoCache to implement IDisposable and clean up the runspace pool by JamesWTruher · Pull Request #1335 · PowerShell/PSScriptAnalyzer

The Helper is recreated with every invocation of Invoke-ScriptAnalyzer which essentially resulted in a runspace which was not cleaned up for every invocation.
I saw 100s of runspaces (ia get-runspace) in my session. I also gave the CommandInfoCache it's own runspace pool and implemented IDisposable in it.
Lastly, I've added a test to catch this in the future.

It no longer needs to be IDisposable
Implement dispose in cache along suggested guidelines

Co-Authored-By: Christoph Bergmeister [MVP] <c.bergmeister@gmail.com>