Improve content invalidation audit logging (#4689) (#4728)

* Improve content invalidation audit logging

When this API was rewritten to Go, the audit logging was made too terse.
Improve it to provide as much information as TO-Perl provided.

* Add changelog entry

(cherry picked from commit 436b0468d23f731a2f39622f804a13bcd389fedb)
2 files changed