fix(policies): handle provider 404

[migmartri]

from

ERR validation error: failed to get policy 'sbom-present': failed to resolve policy: error executing policy request: Get "http://localhost:8002/v1/policies/sbom-present": dial tcp [::1]:8002: connect: connection refused. Available providers: [chainloop]

to

ERR policy "cyclonedx-freshness" not found

and

ERR validation error: failed to get policy 'sbom-present': policy "sbom-present" not found