Draft: Conversion of the todo page into a Vue application

What does this MR do and why?

THIS IS JUST A PROOF-OF-CONCEPT THAT WILL BE BROKEN DOWN INTO THE NEEDED MRS.

Backend changes MRs:

• Exposed target path and access request data on ... (!148782) • Marco Zille • 16.11
• Exposed note body first line on GraphQL (!148829) • Marco Zille • 16.11
• Added added_approver to the todo action enum in... (!148831 - merged) • Marco Zille • 16.11
• Exposed web_path on the MR GraphQL type (!148780 - merged) • Marco Zille • 17.0
• Added possibility to sort todos from GraphQL (!149020 - merged) • Marco Zille • 16.11

Frontend changes MRs:

• TBD

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

N.A.

How to set up and validate locally

N.A.