Fix artifact names (post Gradle to 8.5 update)

[reta]

Description

Fix artifact names (post Gradle to 8.5 update, #377)

Issues Resolved

Fixes GA failures (see please https://github.com/opensearch-project/opensearch-hadoop/actions/runs/7442871457/job/20246931394)

Run for i in `find . -path '*/distributions/*' -name "*.jar" -type f`; do sha1sum "$i" >> "$i.sha1"; done
sha1sum: ./build/poms/extension: No such file or directory
Error: Process completed with exit code 1.

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[reta]

@Xtansia minor fix for final archive name generation please, thank you