PrettyNaming: remove the extra checks in `AddBackticksToIdentifierIfNeeded`

[auduchinok]

Tries to fix the normalization of identifiers like this one:

```foo`.``

[github-actions[bot]]

:heavy_exclamation_mark: Release notes required

---

:white_check_mark: Found changes and release notes in following paths:

Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/8.0.300.md

[psfinaki]

Any tests here? :) I think we had something for pretty naming.

[auduchinok]

I think we had something for pretty naming.

Could you point me to them, if you have an idea of where to look at, please?

[psfinaki]

Mmm this I guess? 👀

[vzarytovskii]

Tries to fix the normalization of identifiers like this one:

```foo`.``

Is this missing something or ready to merge?

[auduchinok]

Is this missing something or ready to merge?

I think I should add some tests, as @psfinaki has suggested. Otherwise it should be good to go in.

[abonie]

Converting to draft for the time being, since it is still missing the tests