refactor(lsp): minor improvements to handling closed documents

[kitsonk]

This improves #10897 but doesn't completely resolve it.

The problem is that when a document with the same name of another document is re-opened, and that version of the document happened to not be changed, the version is both "1" and so tsc things nothing has changed and provides the diagnostics it provided before in response. This means:

• If you open a document, but don't edit it.
• You rename or delete that document.
• You then rename another document to that original document.
• That "new" document will have the diagnostics for the previous file up until the file is edited.

I looked at how vscode handles this situation with the built in TypeScript language server and they have a complex buffer system where the re-calculate all the diagnostics. I will look into it further down the road, but these changes are the best that can be done right now.