According to https://issues.redhat.com/browse/QUARKUS-2729, QPID JMS should be delivered as a party of RHBQ build.
3.15.1.ER1 doesn't contain pom.xml for quarkus-qpid-jms-bom (folder quarkus-qpid-jms-bom/3.15.1.temporary-redhat-00006/ is empty) and doesn't contain platform descriptor and platform properties at all (compare to operator-sdk):

$  ls -1 rhbq-3.15.1.ER1-repo/com/redhat/quarkus/platform/
quarkus-bom
quarkus-bom-quarkus-platform-descriptor
quarkus-bom-quarkus-platform-properties
quarkus-camel-bom
quarkus-cxf-bom
quarkus-maven-plugin
quarkus-operator-sdk-bom
quarkus-operator-sdk-bom-quarkus-platform-descriptor
quarkus-operator-sdk-bom-quarkus-platform-properties
quarkus-qpid-jms-bom

Additionally, there are no sources for quarkus-quarkus-qpid-jms-parent artifact