WIP: Refactor time tracking

What does this MR do?

Refactor time tracking so that we can use one resource to update all the other vue app's inside the sidebar

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

Not sure if issuable_bundle.js is setup correctly

Why was this MR needed?

Prep for realtime

Screenshots (if relevant)

None

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • 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?

None