Better feedback when copying URLs

When on the integrations page in the settings, one can create a custom GitHub/GitLab self-hosted GitPod integration. When creating an integration, the user has to copy a redirect URL, which is triggered by pressing a button. That's alright, but I think we can have some sort of feedback when the copying was either successful or if there was a problem with it.

Approach

The icon in use is (AFAIK) duplicate from Heroicons. This leaves 2 options I can think of:

1. After onClick, the icon could be changed to check or x, depending on the result
2. The initial icon could be changed to clipboard or clipboard-copy and after a successful copy to clipboard-check (what about if it fails though.)

The code is located here:
https://github.com/gitpod-io/gitpod/blob/6f15a4355420eddec28478b175311c843e4a1198/components/dashboard/src/settings/Integrations.tsx#L652

Start in components/dashboard/src/settings/Integrations.tsx around line 652 and inspect the redirect-URL copy button and its onClick behavior. Determine how successful and failed copying should be represented, then verify that the UI gives distinct feedback for both outcomes.