[jk] Prevent renamed triggers in code from being duplicated

[johnson-mage]

Description

• Renamed triggers saved in code (i.e. saved in triggers.yaml file) would update the pipeline schedule in the db, but not the trigger in the trigger config file, resulting in the original trigger being recreated. This PR fixes this so the trigger saved in code is not duplicated.
• Addresses github issue [BUG] Triggers duplicating after renaming #4862

How Has This Been Tested?

Checklist

• The PR is tagged with proper labels (bug, enhancement, feature, documentation)
• I have performed a self-review of my own code
• I have added unit tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

cc: