src: fix performance regression in node_file.cc

[bnoordhuis]

Commits dcb6929, 4396beb and 8a96d05 turned the O(n) scan in InternalModuleReadJSON() into an O(4n) scan. Fix the performance regression by turning that into a linear scan again.

cc @guybedford @jkrems

[jkrems]

Do we know that it's a performance issue or is this more of a nice-to-have? I assume it's non-trivial to add because I don't see a pre-existing implementation of strpos with multiple needles in node?

[ryanmurakami]

@bnoordhuis The Moderation Team is requesting that you change the issue title. The Moderation Team believes the similarities to an American politician's campaign slogan is not in line with the Code of Conduct's guide to use "welcoming and inclusive language". The Moderation Team is happy to provide external references should you need them.

[ljharb]

Landed in #31343