Add quota information for job API

What does this MR do?

Add new porperty quota under the runner property from the response Projects::JobsController#show.json bu updating the RunnerEnitiy

To Do

• Add json schema when ce-to-ee synced
• Merge gitlab-org/gitlab-ce!21495 first since it has the tests changes needed
• Merge gitlab-org/gitlab-ce!21525 first since it's a port of some changes from this MR

What are the relevant issue numbers?

#7441 (closed) Closing issue

gitlab-org/gitlab-ce#50101 Vue/Vuex refactoring

gitlab-org/gitlab-ce#51093 Prerequisite issue in CE

gitlab-org/gitlab-ce!21525 Prerequisite MR in CE

gitlab-org/gitlab-ce!21618 Adding runners property

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• EE specific content should be in the top level /ee folder
• For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?

Closes #7441 (closed)