Manage / admin the GitLab Managed State
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### Problem to solve
Available only to project maintainers. Users of the GitLab Managed Terraform state would need various administration tools.
What these tools might be?
- remove state lock
- remove the state file from storage
- see the state file as a json
- see the various versions of a state file
A single project might have multiple state files attached.
### Intended users
* [Delaney (Development Team Lead)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#delaney-development-team-lead)
* [Devon (DevOps Engineer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#devon-devops-engineer)
* [Allison (Application Ops)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#allison-application-ops)
* [Priyanka (Platform Engineer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#priyanka-platform-engineer)
### User experience goal
Manage various aspects of Terraform-related GitLab resources through the UI.
### Proposal
- a Terraform resource is identified by the project it belongs to and the final part of the backend address configuration `-backend-config="address=https://gitlab.com/api/v4/projects/<YOUR-PROJECT-ID>/terraform/state/<YOUR-STATE-NAME>"`
- the details view should provide various actions:
- remove state lock
- see the state file as a json
- remove the state file from storage
- see the various versions of a state file - can be in a separate issue related to https://gitlab.com/gitlab-org/gitlab/-/issues/207347
#### Proposed merge requests:
- [backend] Endpoint to list states (file data not included): https://gitlab.com/gitlab-org/gitlab/-/merge_requests/43375
- [backend] Endpoint to view file from latest version: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/45848
- [backend] Mutation to unlock: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/43955
- [backend] **TBC** Mutation to lock: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/43955
- [backend] Mutation to delete: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/43955
- [backend] Endpoint to view version history (EE): [TODO]
- ...
### Further details
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### Permissions and Security
<!-- What permissions are required to perform the described actions? Are they consistent with the existing permissions as documented for users, groups, and projects as appropriate? Is the proposed behavior consistent between the UI, API, and other access methods (e.g. email replies)?-->
### Documentation
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### Availability & Testing
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What risks does this change pose to our availability? How might it affect the quality of the product? What additional test coverage or changes to tests will be needed? Will it require cross-browser testing?
Please list the test areas (unit, integration and end-to-end) that needs to be added or updated to ensure that this feature will work as intended. Please use the list below as guidance.
* Unit test changes
* Integration test changes
* End-to-end test change
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### What does success look like, and how can we measure that?
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### What is the type of buyer?
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### Is this a cross-stage feature?
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### Links / references
epic