TriggerMenuMT: disable menu DOT files and increase unit test timeout

Disable the generation of DOT files in the CA tests that became too slow and produces too large of an output.

Also temporarily increase CA unit test timeout.

Relates to ATR-28608.

cc @fpastore

Trigger/TriggerCommon/TriggerMenuMT/scripts/test_menu_CA.py

@@ -19,7 +19,7 @@ JobProperties.jobPropertiesDisallowed = True
 # Set flags
 flags = initConfigFlags()
 runHLT.set_flags(flags)
-flags.Trigger.generateMenuDiagnostics = True
+flags.Trigger.generateMenuDiagnostics = False
 flags.Common.isOnline = True    # online environment
 flags.Input.Files = []          # menu cannot depend on input files