Drop ISourceTextFactory/IFSharpLspServer from test names

[dawedawe]

…codebase, let's have simpler test names

WHAT

🤖[deprecated] Generated by Copilot at e9f83ce

This pull request simplifies and refactors the LSP test code by using a consistent RoslynSourceTextFactory for creating source texts and removing unnecessary parameters and test cases. It affects the files InlayHintTests.fs, Program.fs, and FindReferencesTests.fs.

🤖[deprecated] Generated by Copilot at e9f83ce

We are the Roslyn legion, we forge the source of truth
We purge the useless parameters, we streamline the test of proof
We unify the LSP server, we crush the code complexity
We are the Roslyn legion, we reign in text analysis

🔥🎨🔧

WHY

Now wIth only one ISourceTextFactory and one IFSharpLspServer implementation in the codebase, let's have simpler test names.
Of course, this only makes sense without plans to have multiple implementations again. If there are plans, ignore this PR :)

HOW

🤖[deprecated] Generated by Copilot at e9f83ce

• Simplify the test infrastructure by using a fixed source text factory and LSP server implementation (link, link, link, link, link)

[TheAngryByrd]

Thanks! Definitely missed this in my big refactoring pass.

Probably unrelated but why are some format checks failing occasionally?

[dawedawe]

Good question. The failings are jumping randomly between 6/7/8 and OS.
So my guess is something funky on the GH instances. But I have no idea how to debug this further.