If Sentry Relay is configured and a user visits Sentry to retrieve the DSN key, it will still show the public endpoint

### Problem Statement

Currently, if a user has Sentry Relay deployed and visits the Sentry UI to retrieve the DSN key, it will still show the public endpoint.

This may result in some users bypassing the Sentry Relay configured.

### Solution Brainstorm

If the Sentry Relay is configured, it would be ideal if Sentry can automatically replace parts of the DSN to match the address at which Relay is reachable or at least provide a note to replace parts of the DSN to match the address at which Relay is reachable.
This would help with our overall user experience of the platform.

### Product Area

Settings - Projects