Revert "Check for fixup commits on CI"

This reverts commit 7652d579f5.

Not working on forks, and I don't have time to fix right now

scripts/check_for_fixups.sh

@@ -1,25 +0,0 @@
-#!/bin/sh
-
-base_ref=$1
-
-# Determine the base commit
-base_commit=$(git merge-base HEAD origin/"$base_ref")
-
-# Check if base_commit is set correctly
-if [ -z "$base_commit" ]; then
-    echo "Failed to determine base commit."
-    exit 1
-fi
-echo "Base commit: $base_commit"
-
-# Get commits with "fixup!" in the message from base_commit to HEAD
-commits=$(git log -i -P --grep "fixup\!" --format="%h %s" "$base_commit..HEAD")
-
-if [ -z "$commits" ]; then
-    echo "No fixup commits found."
-    exit 0
-else
-    echo "Fixup commits found:"
-    echo "$commits"
-    exit 1
-fi