Clarify language when creating new git branch

#89348

And fixup grammar to correctly highlight it

None of the apis being users for this experimental setting require the latest TS version

For #13953

**Problem**
We'd like to show project wide diagnostics, however at the moment TS server is single threaded. This means that computing all these diagnostics would interrupt other user operations such as completions.

Right now, our advice is to use tasks to get around this limitation (since tasks always run as separate process) however few people actually use tasks.

**Change**
This change adds an experimental `tsserver.experimental.enableProjectDiagnostics` setting (default false) that makes VS Code spawn a separate TS Server that is only used for computing diagnostics. This should help keep the primary syntax server responsive while letting the diagnostics server churn away at project level diagnostics

**Why experimental?**

- We are comporting too many diagnostics. This is bad for larger projects. I don't think TS provides the right APIs to know which files we actually need to request diagnostics on when a file changes.

- This hasn't been fully extensively tested to make sure it plays nicely with feature such as automatic type acquisition or in complex workspace with multiple projects

Makes it more difficult to mistaktenly reverse which server is which

Updating projects should be handled by the `projectsUpdatedInBackground events` now

For #89348

Use MutationObserver for Monaco Editor AutomaticLayout

Rename "Contributions" to "Feature Contributions"

When using the git extension, the intent is clear when clicking on "+ Create new branch..." and immediately being prompted "Please provide a branch name". But, when clicking on "+ Create a new branch from..." the intent is ambiguous, since the statement "Please provide a branch name" could refer to the branch from which you wish to base the new branch on or the name of the new branch, the latter being what actually happens.

By specifying "Please provide a *new* branch name...", the intent is clear: the prompt is asking for the name you wish to call the new branch.

fixes #89669

#89111

Move indent right one when the highlighted line is a scope start/end