[v11.x backport] tls cleanups
Backport of https://github.com/nodejs/node/pull/25861 and https://github.com/nodejs/node/pull/25929
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines