external: range job keys and region split keys are 2 concepts (part 1) (#55659) #55781
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This is an automated cherry-pick of #55659
What problem does this PR solve?
Issue Number: ref #55374
Problem Summary:
What changed and how does it work?
This is the first part of making job range keys and region split keys 2 different concetps, and it's only related to external engine changing. In next PR I'll change how lighting local backend will use them.
Check List
Tests
Side effects
Documentation
Release note
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