Implement Delete Project and use it in Dashboard

[easyCZ]

[gtsiolis]

Cross-posting for visibility and in case this is something we'd like to add at the same time here.

• Move project removal action under project settings #7273

See design specs in #7273 (comment).

[easyCZ]

Thanks @gtsiolis. I'm keen to keep this change entirely transparent to the end user to ensure we have an easy way to validate the APIs are doing what they should.