Conversion of the todo page into a Vue application

What does this MR do and why?

After a bunch of MRs by @zillemarco, this is a status quo implementation of a port of the Todos App to a Vue app. Not all the functionality is there, but it is a good status quo to iterate on.

Backend changes MRs:

• Exposed target path and access request data on ... (!148782 - merged) • Marco Zille • 17.4
• Exposed note body first line on GraphQL (!148829 - merged) • Marco Zille • 17.1
• 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:

• Added todos_vue_application feature flag (!162587 - merged) • Lukas Eipert, Marco Zille • 17.4

Relates to: #464069

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

What	Video
First iteration	Screen_Recording_2024-09-03_at_17.10.11
Second iteration (showing resizing and functioning links)	Screen_Recording_2024-09-04_at_14.26.52

How to set up and validate locally

1. Enable the todos_vue_application feature flag (e.g. via /rails/features)
2. Go to /dashboard/todos/vue