Update reproduce_comparison to return UNSTABLE for differences found

[andrew-m-leonard]

Fixes #791

Updated results to UNSTABLE if repro_compare returns a difference.
Also changed failures to un-tar to be FAILUREs.

Test compare: https://ci.adoptium.net/view/ReproducibleBuild/job/jdk21-mac-aarch64-temurin_reproduce_compare/7/

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[sophia-guo]

it would be better if the return code of https://github.com/adoptium/temurin-build/blob/master/tooling/repro_compare.sh can be differentiated as 0 ( same ), 1( errors), 2 (different). Correspondingly the jenkins jobs status would be SUCCESS, FAILURE, UNSTABLE. If @andrew-m-leonard agree I can open a separate issue in temurin repo.

[andrew-m-leonard]

it would be better if the return code of https://github.com/adoptium/temurin-build/blob/master/tooling/repro_compare.sh can be differentiated as 0 ( same ), 1( errors), 2 (different). Correspondingly the jenkins jobs status would be SUCCESS, FAILURE, UNSTABLE. If @andrew-m-leonard agree I can open a separate issue in temurin repo.

Yes please @sophia-guo good plan

[smlambert]

This also somewhat relates to converting this to a real test case (where there are specific / defined error codes and messages).