New GPG key cannot be set

I have removed my old GPG key, but when trying to add my new key using cURL I receive:

```
Code: 908
Name: KEY_NEED_REVOKE
Description: You need to delete your active key before uploading a new one
```

Start by reproducing the cURL request after removing the old GPG key, then trace how key deletion and replacement are handled. Done means a new key can be uploaded after the old active key is removed, without receiving KEY_NEED_REVOKE.

Written by the indexing model from the issue text.