Disable legacy apis

[rymsha]

image and attachment built-in apis are replaced by media endpoint api and should be disabled by default.
service built-in api is replaced by named apis and should be disabled by default.

They should be marked for removal in the next major version (XP9).

There should be a configuration parameters (per each) in portal.cfg to enable them.

[anatol-sialitski]

To make the migration to the Harmonized API smoother, we left the default values as true. Once the migration is complete, we must change the default values from true to false. That should be done in #10594.