Improve sorting and table header cell in GLQL

What does this MR do and why?

Improve sorting and table header cell in GLQL

• Add support for sorting to source/target projects, reviewers, MR author, MR approvers, status, and iteration.
• Change milestone sort to sort by due date
• Change header row color on hover
• Ellipsize header cell if too long

Changelog: added

References

• Fixes #526120 (closed)
• Fixes remaining one item in #502701 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Create a GLQL table

   ```glql
   display: table
   fields: state, created, updated, status, title as "Some title hlkhkjlh jkh jkgkjg kjg jkg jkg kj gjk really long title", labels("Aft*"), labels as "Remaining Labels", iteration, milestone
   query: type = Issue 
   limit: 7
   ```

2. Hover/click on the header

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