Add a textbox in the UI for each DAG that can be used to write a comment related to a DAG

[SangwanP]

Description

A textbox is added to the UI next to each DAG to write/modify information regarding the DAG directly in the UI.

Use case/motivation

I work on a team and currently we are unable to relay information regarding a DAG through the UI. For example: reason why a maintainer temporarily disabled a particular DAG.
The DAG doc_md is not very useful in this case since that lives in code - which has to go through a review process. It is a better candidate for displaying lasting information in our case.
In general, this feature can be used to display/modify any information regarding a DAG.

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

[potiuk]

There was an ongoing work here: #17181 on similar thing, but it was abandoned. Maybe you would like to teke-over and complete it @SangwanP ?

[potiuk]

And the issue is described here as well #16790

[potiuk]

I mark it as duplicate of #16790 and close - but you can work on it @san if you would like to get it.

[SangwanP]

@potiuk - Okay, I'll try to get to it. Just a question - I see that the scope of the linked issue is quite large (notes for multiple tasks accessible from multiple places), I assume there is no issue if I only work on the 'Dag notes' functionality of that issue?