[JENKINS-74074][JENKINS-74751] Extract inline JavaScript & remove eval call

[yaroslavafenkin]

• https://issues.jenkins.io/browse/JENKINS-74074
• https://issues.jenkins.io/browse/JENKINS-74751

Testing done

Before the change (eval)
Before the change (inline script blocks)

After the change (includes Handlebars change too)

Proposed upgrade guidelines

N/A

Submitter checklist

• The Jira / Github issue, if it exists, is well-described.
• The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples).
  • The changelog generator for plugins uses the pull request title as the changelog entry.
  • Fill in the Proposed upgrade guidelines section only if there are breaking changes or changes that may require extra steps from users during the upgrade.
• There is automated testing or an explanation that explains why this change has no tests.
• New public functions for internal use only are annotated with @NoExternalUse. In case it is used by non java code the Used by {@code <panel>.jelly} Javadocs are annotated.
• New or substantially changed JavaScript is not defined inline and does not call eval to ease the future introduction of Content Security Policy (CSP) directives (see documentation).
• For dependency updates, there are links to external changelogs and, if possible, full differentials.
• For new APIs and extension points, there is a link to at least one consumer.
• Changes in the interface are documented.

Maintainer checklist

Before the changes are marked as ready-for-merge:

• Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.
• Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
• Proper changelog labels are set so that the changelog can be generated automatically. See also release-drafter-labels.