Make LossLessDefaulter selective to only prevent dropping fields outside of schema.

[mbobrovskyi]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Make LossLessDefaulter selective to only prevent dropping fields outside of schema.

Which issue(s) this PR fixes:

Fixes #3174

Special notes for your reviewer:

For more information see:

• https://jsonpatch.com/
• https://datatracker.ietf.org/doc/html/rfc6902/
• https://datatracker.ietf.org/doc/html/rfc6901

Does this PR introduce a user-facing change?

NONE