Add more filters to dashboard issues refactor

What does this MR do and why?

This MR adds more filters to the dashboard issues Vue refactor.

It adds confidential, search-within, and type filtered search tokens, and also adds the ability to do OR filtering for assignees, authors, and labels.

Behind feature flags vue_issues_dashboard and root_level_issues_query default disabled

Screenshots or screen recordings

Screen_Recording_2023-01-23_at_4.38.14_pm

How to set up and validate locally

1. In rails console enable the feature flags

   Feature.enable(:vue_issues_dashboard)
   Feature.enable(:root_level_issues_query)

2. Visit the issues dashboard page http://127.0.0.1:3000/dashboard/issues

3. Perform filtering to check MR

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #379025 (closed)