Add JMOD signing retry and check curl rc

[andrew-m-leonard]

Add retry to the JMOD Windows&Mac signing, as a workaround until EF upstream issue is resolved: https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/3758
This is likely to fail during the release builds with the current failure rate.

[github-actions]

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[karianna]

Can we wrap this in a flag or comment what we should revert later?

[andrew-m-leonard]

Can we wrap this in a flag or comment what we should revert later?

I think having an issue is probably best as this retry logic is in multiple places/repos, raised adoptium/temurin-build#3496

[andrew-m-leonard]

run tests

[eclipse-temurin-bot]

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