src,crypto: refactor `crypto_tls.*`

By the design of `GetSSLError()`, the V8 API was unnecessarily being
accessed in places where it eventually didn't get used. So this refactor
inlines the function appropriately in places where it was being used.
Also, this replaces uses of `AllocatedBuffers` with `BackingStore`s.

Signed-off-by: Darshan Sen <darshan.sen@postman.com>

PR-URL: https://github.com/nodejs/node/pull/40675


Reviewed-By: Anna Henningsen <anna@addaleax.net>