Accessibility - Add TaskInstance State to tiTooltip in RBAC UI

[harrisjoseph]

Currently there is no way to determine the state of a TaskInstance in the graph view or tree view, for people with Colour blindness

An estimated 4.5% of people experience some form of colour vision deficiency

I haven't seen any testing around task-instance.js, but will gladly write a test, or update any existing test

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[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contribution Guide (https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst)
Here are some useful points:

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[harrisjoseph]

Screenshots of the updated tooltip for reference:

[boring-cyborg]

Awesome work, congrats on your first merged pull request!

[ashb]

Thanks @harrisjoseph (:gb: :pencil2: FTW.)

[harrisjoseph]

Thank you. It's an honour and a privilege. 🙇