Add stuck field in BuildDetailEntity

Frontend currently defines when a job is stuck, which we already have in
the backend, expose `stuck` field in the
`Project::JobsController#show.json` so the duplication of the logic is
removed.

Use `stuck` flag from API

Removes isJobStuck check from frontend and uses
the flag being provided by the API

Renders missing tags message

Moves available runners check into a computed prop

Fix changelog for stuck job