Telescope create branch filter

[polarmutex]

trafficstars

When you use telescope to create a worktree filter out branches that already have worktree that should cause an error if you did create them

[matu3ba]

Can you rephrase this into a readable sentence?

[polarmutex]

basically when creating a worktree using treesitter, we should filter out branch names that already have a worktree associated with them (since git worktree will not let you create a second tree from a branch)

[ThePrimeagen]

@polarmutex I like this idea.

There are some things that could make things a bit easier.