Fix/Prevent erounus Next.js API route warning, on non-Next.js apps

[Lissy93]

Summary

This PR resolves an issue where developers receive misleading warnings about the placement of API files in non-Next.js projects hosted on Vercel.

The current logic triggers a warning when any file under the pages/ directory loosely starts with pages/api, which could include unrelated directories like pages/api-docs. This results in unnecessary confusion for developers not using Next.js for their project.

Changes

Updates the if statement in hasNextApiFiles to strictly check for files within pages/api/ or src/pages/api/, and NOT file names which just happen to start with the word api-. I also added a check to ensure that warnings related to Next.js API file placement are only shown if the project is indeed using Next.js.

Links

Fixes #11696

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[Lissy93]

I've opened up a ticket, re: #11696
In case that's needed before a PR?

[Lissy93]

Hey @EndangeredMassa and @TooTallNate - any chance for a review if you have a second?