Disable create list button when create list modal is already open

What does this MR do and why?

When a user clicks the create list button, the button then becomes disabled and then shows a tooltip letting the user know they should finish creating the list before moving forward

Resolves #324282 (closed)

Screenshots or screen recordings

2021-10-08_16.25.11

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

  1. Go to issue boards page
  2. Click on create list

MR acceptance checklist

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

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