[JENKINS-75512] Ensure SIGPIPE is not hidden when calling shell script to avoid hanging.

[Romain-Geissler-1A]

This change aims at fixing the hanging issue we hit when using a JDK 21 agent image to run Jenkins and some sh command that require SIGPIPE to work fine in order to finish. See the example of such a command in the ticket JENKINS-75512 (https://issues.jenkins.io/browse/JENKINS-75512) as well as explanations.

Here we wrap the call to nohup by a call to env --default-signal=SIGPIPE to avoid this issue. Since not all Linux distro will support env --default-signal=SIGPIPE (this flag was introduced in 2019 in coreutils), wrap this in some more complex shell command to be able to fallback to not using env at all if the OS doesn't support it.

Testing done

The details of the testing done is in the ticket JENKINS-75512 (https://issues.jenkins.io/browse/JENKINS-75512) (checked via commands run inside a fedora container).

Submitter checklist

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• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
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[jglick]

As a rule, we prefer not to add complications to the wrapper shell script. Does the binary wrapper handle this situation better? If not, could it be patched to do so?