UX: Move GitLab Agent config to UI element

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MR: Pending

Description

We need to explore the UX around moving away from the GitLab agent configuration file and into some UI element such as the agent administration section in Operate > Kubernetes clusters as proposed in &11631 (comment 1871248508)

The initial field to drive this location in the UI will be max_hours_before_termination_limit.

• See Workspaces Settings Configuration Infrastructur... (&14186) for overview and more context
• See Related Issues and MRs section in that epic for related issues and MRs

Acceptance Criteria

• Adds new page for "Workspaces agent configuration settings"
• Ensure that the "unset" functionality is supported.
• Adds necessary GraphQL API support and tests
• Fully exercise new behavior in request and feature level integration tests.

Design Requirements

Adds a new page to view/edit workspace agent configuration settings.

This new page will be accessible via a new Workspace agent configuration settings option under the Actions menu in the agent row of the Kubernetes cluster agents list:

"Unsetting" behavior

We also need to define how users can "unset" a setting, and let it return to the default, non-overridden value.

See this related discussion on the UX/design around this in the internal Cascading Settings meeting notes: https://docs.google.com/document/d/1_wnE_UM3snxoY0SJKn8Ol4GT1NBXHQSdmkXNToxIZv8/edit#bookmark=id.hc1dfs6o4dw