Improve token auth migration #16822

Description:

as discussed. will basically look like this:

Review

• [ ] Functional review done
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done see checklist
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

Noticed the core:matomo4-migrate-token-auths command doesn't provide any output, maybe a 'Done.' message would be useful to have?

Updated it 👍