Displaying a prompt when user clones repository that exists locally

[rdosanjh]

Fixes #48490

This stores the fetchUrl, repository Location and last updated in the global store. If the amount in the store hits 50 it will empty the least recently updated repos.

When cloning a repo it will look up the fetch url on the list in the global store and then check that the directory exists.

I started by using a map object using the fetchUrl as a key for fast lookup. This increased the amount of code needed to limit the amount to 50. I decided that for 50 records a map and an array wouldn't be too different in performance.

Let me know what you think of the approach.

I spent some time trying to write tests around this but i was finding it difficult to mock the Repository class from git.ts. I was going to extract an interface and create a Mock implementation but as the area isn't well covered i decided i should talk to somebody on the team before going ahead with that.

[joaomoreno]

Sorry for the late review.

Quite some issues with this PR:

• Use of sync Node API is a no-no
• Lack of explicit typing... we need to type every function's return value, for example
• Lack of code style preservation
• Confusing return types, eg getRepositoryLocation returns boolean | string
• Updating the knownRepositories structure occurred in one place, while reading from it occurred in another place.
• The slicing of the knownRepositories array occurred after reading it from storage instead of before writing it to storage. Also, sorting it all the time is irrelevant if we simply use the array as a queue.
• KnownRepository should not be declared in the public API git.d.ts file
• What if only pushUrl is defined in a remote?
• What if a remote is referenced in two separate local repositories?