Improve mac signing in pipeline

[steelhead31]

Fixes #596

Checks for success of mac signing service, and retries to reduce impact of intermittent failures.

These changes align with those made in temurin-build / sign.sh ( see PR : 3431 )

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[andrew-m-leonard]

run tests

[eclipse-temurin-bot]

 PR TESTER RESULT 

✅ All pipelines passed! ✅

[smlambert]

LGTM

[andrew-m-leonard]

lgtm