WIP: Include deploy history on metric chart for Environments page

Adds controller endpoint returning JSON document with last 8.hours of deployments information for specified environment.

Are there points in the code the reviewer needs to double check?

This MR needs still needs some frontend work. It also includes code from other MR !9950 (closed) for easier merging

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Tests for Backend portion
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Related to #26914 (closed)