Revert "Use gh workflow for tests" (#41411)

Reverts zed-industries/zed#41384

The branch-protection rules work much better when there is a Job that
runs every time and can be depended on to pass, we no longer have this.

Release Notes:

- N/A

script/prettier

@@ -1,17 +0,0 @@
-#!/bin/bash
-set -euxo pipefail
-
-PRETTIER_VERSION=3.5.0
-
-pnpm dlx "prettier@${PRETTIER_VERSION}" assets/settings/default.json --check || {
-    echo "To fix, run from the root of the Zed repo:"
-    echo "  pnpm dlx prettier@${PRETTIER_VERSION} assets/settings/default.json --write"
-    false
-}
-
-cd docs
-pnpm dlx "prettier@${PRETTIER_VERSION}" . --check || {
-    echo "To fix, run from the root of the Zed repo:"
-    echo "  cd docs && pnpm dlx prettier@${PRETTIER_VERSION} . --write && cd .."
-    false
-}