fm examples not working without using CLI

[vdesabou]

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16:58:29 ℹ️ 🛠️ Creating 🌎onprem connector S3_SINK_vsaboulin
16:58:29 ℹ️ 📋 🌎onprem connector config has been copied to the clipboard (disable with 'playground config set clipboard false')
16:58:30 ℹ️ ✨ Following config was added to handle environment ccloud:
15a16,17
>   "topic.creation.default.partitions": "-1",
>   "topic.creation.default.replication.factor": "-1",
16:58:30 🔥 Command failed with error code 500
16:58:30 🔥 Failed to find any class that implements Connector and which name matches S3_SINK, available connectors are: PluginDesc{klass=class io.confluent.connect.azure.servicebus.ServiceBusSourceConnector, name='io.confluent.connect.azure.servicebus.ServiceBusSourceConnector', version='1.2.11', encodedVersion=1.2.11, type=source, typeName='source', location='file:/usr/share/confluent-hub-components/confluentinc-kafka-connect-azure-service-bus/lib/'}, PluginDesc{klass=class org.apache.kafka.connect.mirror.MirrorCheckpointConnector, name='org.apache.kafka.connect.mirror.MirrorCheckpointConnector', version='7.6.1-ce', encodedVersion=7.6.1-ce, type=source, typeName='source', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.mirror.MirrorHeartbeatConnector, name='org.apache.kafka.connect.mirror.MirrorHeartbeatConnector', version='7.6.1-ce', encodedVersion=7.6.1-ce, type=source, typeName='source', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.mirror.MirrorSourceConnector, name='org.apache.kafka.connect.mirror.MirrorSourceConnector', version='7.6.1-ce', encodedVersion=7.6.1-ce, type=source, typeName='source', location='classpath'}