[JENKINS-74053] Extract inline script block in BuildPipelineView/configure-entries.jelly

[shlomomdahan]

JENKINS-74053

Testing done

Before change: CSP Violation

After Change: the CSP violation no longer appears.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[basil]

Thanks!