Pipelines store actions & states in web IDE

What does this MR do?

This adds the Vuex store module for pipelines & CI jobs to the web IDE. To get the data for the pipelines & CI jobs we use the public API to fetch this data. For the jobs, we load each page of the API call until no more pages exist.

This does not add any public facing components so has no impact on the user. Another merge request after this will add the components on top by using this received data.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/44604