Revert "Merge branch '421483-update-product-analytics-cluster-settings-fields' into 'master'"

https://gitlab.com/gitlab-com/gl-infra/production/-/issues/16274

Make db/post_migrate/20230822195852_remove_pa_jitsu_related_settings.rb
a no-op.

This reverts commit 380bb17b, reversing
changes made to 061f8fe3.

[skip-db-structure-check]