fix(detectors): handle arrays when checking for openapi and swagger

[elsapet]

Description

If we have a JSON array, the OpenAPI detector can't convert it into the expected OpenAPI struct.
Fallback to json/yml detectors in this case

Checklist

• I've added test coverage that shows my fix or feature works as expected.
• I've updated or added documentation if required.
• I've included usage information in the description if CLI behavior was updated or added.
• PR title follows Conventional Commits format

[swarmia]

✅  Linked to AMA-3064 · Openapi detector errors when scanning ama
➡️  Part of AMA-2947 · OSS - Curio CLI