Move Pipelines quota to Pipelines (CI/CD) in Settings page for groups
### Description For groups, we have pipelines quota as a standalone page under settings. Since we now have **Settings > Pipelines** (will be **Settings > CI/CD**) for group-level variables, we can consider to move pipelines quota in the same submenu. ### Proposal Move **Settings > Pipelines quota** in **Settings > Pipelines** ### Feature checklist Make sure these are completed before closing the issue, with a link to the relevant commit. - [ ] [Feature assurance](https://about.gitlab.com/handbook/product/#feature-assurance) - [ ] Documentation - [ ] Added to [features.yml](https://gitlab.com/gitlab-com/www-gitlab-com/blob/master/data/features.yml)
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