Use problem functions from openapi repo

[gab-arrobo]

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[Copilot]

Pull request overview

This PR standardizes ProblemDetails creation across PCF services by replacing manual models.NewProblemDetails() construction with shared helper functions from github.com/omec-project/openapi/v2/utils, improving consistency with the OpenAPI repo’s problem definitions.

Changes:

• Switched multiple routers’ “not implemented” default handler responses to utils.ProblemDetailsNotImplemented(...).
• Updated producers to use utils helpers for common error conditions (context not found, mandatory IE missing, and specific causes via ProblemDetailsWithCause).
• Adjusted unit test expectations to build ProblemDetails via the same utils helpers as production code.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
uepolicy/routers.go	Use utils.ProblemDetailsNotImplemented for default 501 ProblemDetails responses.
smpolicy/routers.go	Use utils.ProblemDetailsNotImplemented for default 501 ProblemDetails responses.
policyauthorization/routers.go	Use utils.ProblemDetailsNotImplemented for default 501 ProblemDetails responses.
bdtpolicy/routers.go	Use utils.ProblemDetailsNotImplemented for default 501 ProblemDetails responses.
ampolicy/routers.go	Use utils.ProblemDetailsNotImplemented for default 501 ProblemDetails responses.
producer/oam.go	Replace manual 404 ProblemDetails creation with utils.ProblemDetailsContextNotFound.
producer/callback.go	Replace manual 400 ProblemDetails creation with utils.ProblemDetailsMandatoryIeMissing.
producer/bdtpolicy.go	Replace local/util ProblemDetails creation with utils helpers incl. ProblemDetailsWithCause.
pcftests/pcf_test.go	Update tests to construct expected ProblemDetails via utils helpers.

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