Add merge approval # field in MR form

Zendesk issue: https://gitlab.zendesk.com/agent/tickets/15187

Customer wants the ability to increase the number of approvals on-demand. We currently allow developers to override merge approvers in the merge request form. We could add the number field as well, but only allow setting it higher than the current number.

What do you think @vsizov @JobV ?

The idea is good. And I propose to not show this field if approvers number in project settings is set to zero.

And I propose to not show this field if approvers number in project settings is set to zero.

Definitely not.

Milestone changed to 8.8

Added promised label

Added ~238305 label

Milestone changed to 8.9

mentioned in issue #580

Reassigned to @smcgivern

Started branch 314-add-merge-approval-field-in-mr-form

mentioned in merge request !470 (merged)

Status changed to closed by merge request !470 (merged)

mentioned in commit be89baa6

mentioned in commit ca2adb08

Mentioned in commit be89baa6

Mentioned in commit ca2adb08

Mentioned in issue #580