Remove unused code from ci-image-commands (apache#51643)

Author: potiuk

dev/breeze/src/airflow_breeze/commands/ci_image_commands.py

@@ -21,7 +21,6 @@
 import signal
 import subprocess
 import sys
-import time
 from copy import deepcopy
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -189,19 +188,6 @@ def prepare_for_building_ci_image(params: BuildCiParams):
     make_sure_builder_configured(params=params)
 
 
-def build_timout_handler(build_process_group_id: int, signum, frame):
-    # Kill the forked process group - it will kill the build even if it is running in parallel
-    # with multiple processes and docker build sessions
-    os.killpg(build_process_group_id, signal.SIGTERM)
-    os.waitpid(build_process_group_id, 0)
-    # give the output a little time to flush so that the helpful error message is not hidden
-    time.sleep(5)
-    if os.environ.get("GITHUB_ACTIONS", "false") != "true":
-        get_console().print("::endgroup::")
-    get_console().print()
-    sys.exit(1)
-
-
 def kill_process_group(build_process_group_id: int):
     with contextlib.suppress(OSError):
         os.killpg(build_process_group_id, signal.SIGTERM)