[action] [PR:16116] Run db_migrator for non first-time reboots #16520
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Why I did it
The recent change #15685 (comment) removed the db migration for non first reboots.
This is problematic for many deployments which doesn't rely on ZTP and push a custom config_db.json
Port to older branches after #15685 is ported back
Work item tracking
How I did it
Re-introduce the logic to run the db_migrator on non-first boots
How to verify it
Verified reboot and warm-reboot cases
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)