Remove instance_level_code_suggestions_enabled column
What does this MR do and why?
This is part 2 of dropping the instance_level_code_suggestions_enabled column In %16.10 we added the ignore rule https://gitlab.com/gitlab-org/gitlab/-/issues/440634, and we have an issue for %17.0 to remove the ignore rule https://gitlab.com/gitlab-org/gitlab/-/issues/440636
MR acceptance checklist
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Related to #440635
Edited by Roy Zwambag