Finalize namespace_id backfilling on issues table
What does this MR do and why?
This MR finalizes a batched migration introduced in ~15.4 in !91921 (merged) also changes the FK to cascade delete and introduces not null constraint on issues#namespace_id column.
The migration has been checked as successfully completed on .com DB
The migration ran for ~30 days on .com While the migration was running in %15.6 we introduced a retry mechanism for the batches !101550 (merged)
This migration will check the status of the original migration and if needed run the remaining jobs inline.
Updated version specific upgrading instructions docs for 15.7.0 to ensure that batched migration on issues table introduced in 15.4.0 finished, before upgrading to 15.7.0
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