fix(git_status): Fix worktree not found when use_file_path=true

[P4Cu]

Description

:lua require("telescope.builtin").git_status { use_file_path = true } fails when called from worktree.
This happens because we're looking for .git directory while for worktrees it's a .git file.
I propose a better solution which use git rev-parse --show-toplevel that will work regardless of git internals (similar approach already used in another part of code).

Fixes #3409

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

See #3409 for minimal config that reproduces the issue.

I've tested it on non-worktree/worktree/non-git my full config.

Configuration:

NVIM v0.10.2
Build type: Release
LuaJIT 2.1.1713484068
Run "nvim -V1 -v" for more info

• windows 11 + fedora 47

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)

[P4Cu]

Close in favor of newer approach using nvim9.0 #3417