Remove git_commit syntax highlighting from core Zed (#9025)

Fallback to extension
https://github.com/zed-industries/extensions/pull/307

Release Notes:

- Remove git_commit syntax highlighting from Zed core, `git-firefly` extension replaced that

Co-authored-by: William Desportes <williamdes@wdes.fr>
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
Co-authored-by: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>

crates/languages/src/gitcommit/config.toml

@@ -1,12 +0,0 @@
-name = "Git Commit"
-grammar = "git_commit"
-path_suffixes = [
-  # Refer to https://github.com/neovim/neovim/blob/master/runtime/lua/vim/filetype.lua#L1286-L1290
-  "TAG_EDITMSG",
-  "MERGE_MSG",
-  "COMMIT_EDITMSG",
-  "NOTES_EDITMSG",
-  "EDIT_DESCRIPTION",
-]
-line_comments = ["#"]
-brackets = []