Fix http status when failing to release catalog resource

What does this MR do and why?

Related to Backend: Fix HTTP status code when failing to r... (#431322 - closed)

Fix http status when failing to release catalog resource.

Returning 422 Unprocessable Entity when a release cannot be created due to failures related to versioning the catalog resource.

Fixing also the error message to point users to the directory structure.

Changelog: fixed

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