[v11.x] backport: tls: do not confuse TLSSocket and Socket

This is a backport of https://github.com/nodejs/node/pull/25153. It was the only commit that was not already backported as all other commits where accidentally backported with a following backport and all other commits besides this one are empty (so I skipped them).

Original commit message:

Don't use "socket" to describe two different objects in the same function.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines