src: rename ERR_STRING_TOO_LARGE to ERR_STRING_TOO_LONG

The old error name and message were trying to be consistent with
ERR_BUFFER_TOO_LARGE but they were not really accurate.
The kStringMaxLength was measured in number of characters,
not number of bytes. The name ERR_STRING_TOO_LARGE also
seems a bit awkward. This patch tries to correct them before
they get released to users.

PR-URL: https://github.com/nodejs/node/pull/19864
Refs: https://github.com/nodejs/node/pull/19739


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>