Incorrect service addresses in Source Interface metadata endpoint after data-only backup

[zenmonkeykstop]

Description

After performing a data-only backup, the source interface /metadata endpoint will use the onion service address from the
backup instead of the instance's actual address. If the backup was v2-only or v2+v3, the v2 address will also be listed even if v2 services are disabled.

Steps to Reproduce

• create a v3 instance
• do a data-only restore from a backup with different service addresses.
• observe the /metadata endpoint

Expected Behavior

Only the instance's actual SI interface(s) listed

Actual Behavior

Interface(s) from the backup listed.

Comments

Suggestions to fix, any other relevant information.

[eloquence]

Closing per discussion at sprint planning today since v2_source_url was already removed from the metadata endpoint in #5926.