Scale canary deployments
### Description With https://gitlab.com/gitlab-org/gitlab-ce/issues/38543 you can scale your deployments using the **CI/CD > Environments** page. If you use canary deployments, you should be able to do the same. ### Proposal Implement a flow to scale canary deployments from the **CI/CD > Environments** page. ### ### Design The design is from https://gitlab.com/gitlab-org/gitlab-ee/issues/5416 The labels and all the copying should be revisited to adapt to this new scope. ![01-incremental-rollouts](https://gitlab.com/gitlab-org/gitlab-ee/uploads/ecb3709cdcdf6469dded36741ec67ae8/01-incremental-rollouts.png) *(TODO: Where is the documentation links to?)* ##### Tooltips It has the short help text in a tooltip to explain the terms of `Instances` and `Incremental rollouts`. *(Note: the copy is not ready yet.)* ![01-incremental-rollouts-tooltips](https://gitlab.com/gitlab-org/gitlab-ee/uploads/6559cc7927cd52cdcbd05cbbbe9d6e52/01-incremental-rollouts-tooltips.png)
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