CI: convert galaxy version check to pre-commit + autodetect

tests/scripts/check_galaxy_version.sh

@@ -1,12 +0,0 @@
-#!/bin/bash
-set -e
-
-version_from_galaxy=$(grep "^version:" galaxy.yml | awk '{print $2}')
-
-# TODO: compute the next expected version somehow
-if [[ $KUBESPRAY_VERSION == "v${version_from_galaxy}" ]]
-then
-	echo "Please update galaxy.yml version to match the next KUBESPRAY_VERSION."
-	echo "Be sure to remove the \"v\" to adhere to semantic versioning"
-	exit 1
-fi