build: clarify name and functionality of Maven Central publish step (… #686

Job	Run time
Gradle / Generate Baseline	3m 14s
Gradle / Verify Artifacts (ubuntu-24.04)	4m 53s
Gradle / Verify Artifacts (hiero-block-node-linux-medium)	3m 18s
Gradle / Verify Artifacts (ubuntu-22.04)	4m 43s
publish-simulator	3m 22s
package-protobuf-source	16s
publish-protobuf-jar	3m 27s
publish-app	8m 10s
helm-chart-release-simulator	-1s
helm-chart-release-app	17s
	31m 39s

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