Improvements to the UI for 3.0

[1cadumagalhaes]

Description

Helllo!
I've been using 3.0 and gathered some small things to implement to the UI, and just thought I should open an issue to track them in case other people have suggestions, or to know if any of these is being worked at. My idea is to work on this in the next couple weeks.

• Missing Configurations page in the navbar. On 2.10 it was under admin when exposed ([api].expose_config=true). The page already exists, there's just no entry in the navbar (/configs)
• Missing Test connection button in the connections form. ([core].test_connection=Enabled) (edit: added in the connections page on feat: add test connection button to ui #51055. Not sure its also on the new connection form)
• Tooltips + legend for task status in dag page. (the new icons are great, but I do miss some legend)
• Tasks/taskgroups order on grid view are weird. On 2.x they're mostly ordered. On 3.0 they look random to me (maybe I'm doing something wrong? not sure)
• 404 page (just testing what pages are available, when I go to an invalid one it just renders a blank page. i.e. /cluster_activity).

Some other things that I think would require more work

• Create a user profile/user info page.
• DAG page: run duration, task duration, calendar and gant views.
• Dependency graph for assets
• Migrate pages under security (I assume they're just embeding the pages from 2.x)
• Hability to select groups in DAG page and mark their status as success/failed

Use case/motivation

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[tirkarthi]

Test connection was implemented in #51055 .

[1cadumagalhaes]

Test connection was implemented in #51055 .

Thanks @tirkarthi , I've only checked opened issues but I've not checked the PRs. I'll take a look to see if there's anything else