Improve error logging in pin-bundle-images.sh for EMPTY_SHA

[stuggi]

Add detailed error output when SHA cannot be found for a bundle image. This helps debug issues like local path replacements being processed as bundles.

Error output now includes:

• MOD_PATH: The go module path being processed

• BASE: The extracted operator base name

• REF: The git reference/version

• REPO_URL: The repository URL being queried

• REPO_CURL_URL: The API URL used for queries

• Bundle: The full bundle image reference attempted

  Example output when failing:

      ERROR: Failed to find bundle image SHA for:
        MOD_PATH: ./api
        BASE: api
        REF: 00010101000000-000000000000
        REPO_URL: quay.io/openstack-k8s-operators
        REPO_CURL_URL: https://quay.io/api/v1/repository/./api
        Bundle: quay.io/openstack-k8s-operators/api-operator-bundle:...

[openshift-ci]

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[stuggi]

/retest

[openshift-ci]

@stuggi: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/openstack-operator-build-deploy-kuttl-4-18	d682ea7	link	true	/test openstack-operator-build-deploy-kuttl-4-18

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