Bump issues table bigint conversion cols removable data

Prabakaran Murugesanrequested to merge
update-issues-bigint-conv-cols-remove-with into master

What does this MR do and why?

Extracted from: !167972 (comment 2156629983)

Initialization of these columns were introduced in 17.5, so these ignore_columns can only be removed after N+3 milestones, i.e: 17.8.

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