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Draft: Add exclusive lease to PAT last used update service

Drew Blessing requested to merge dblessing_pat_last_used_exclusive_lease into master

What does this MR do and why?

Add exclusive lease to PAT last used update service

We currently throttle last used at updates by using a simple check that 10 minutes has elapsed. This can still lead to DB contention if multiple threads try to update a record in quick succession. This exclusive lease will ensure only one thread can get a lock to update.

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