fix: dont hardcode "main" in gitlint test

Hardcoding main means the test looks at the wrong range of commits for
feature branches, which can result in problem if feature branches are
long-lived.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/integration_tests/style/test_gitlint.py

@@ -5,6 +5,7 @@
 import os
 
 from framework import utils
+from framework.ab_test import DEFAULT_A_REVISION
 
 
 def test_gitlint():
@@ -15,6 +16,6 @@ def test_gitlint():
     os.environ["LANG"] = "C.UTF-8"
 
     rc, _, stderr = utils.run_cmd(
-        "gitlint --commits origin/main..HEAD -C ../.gitlint --extra-path framework/gitlint_rules.py",
+        f"gitlint --commits origin/{DEFAULT_A_REVISION}..HEAD -C ../.gitlint --extra-path framework/gitlint_rules.py",
     )
     assert rc == 0, "Commit message violates gitlint rules: {}".format(stderr)