[Bug] Add Project Modal - Ignore Background Click, Add Close Button

[jrstrayhorn]

Description

On the Add Project Modal, Ignoring background click to close modal (also disabling the use of the Esc button to close modal) and adding a close button in the top right.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I updated the changelog with an end-user readable description
• [ ] I assigned this pull request to the correct project board to update the sprint board

Steps to Test or Reproduce

1. Add Project
2. Add project manually
3. Insert info until step 3
4. Click outside of modal or hit Esc button, no longer able to close modal.
5. Click x button in top right to close modal

Photos of Project Model with Close button (desktop and mobile views)

Video of Close button working https://user-images.githubusercontent.com/21061492/138181076-a92c421d-d832-4d55-98ec-953fdff74f4e.mp4

Link to issue

Closes: #558

[jrstrayhorn]

Hello @BartvanEijkelenburg , @1SvenHansen , @juliaslaats , @MeesvanStraten ,

I've fixed the merge conflict with the changelog.. let me know if there is anything else I need to do on this PR.

Thanks!!