JENKINS-73941 - ForceSandbox - Unify logic in Script-Security for reducing techDeb

[jgarciacloudbees]

JENKINS-73941 - Option to hide "Use Groovy Sandbox" for users without Administer permission globally in the system

Complements #948

In jenkinsci/script-security-plugin#586, some additional shared methods have been included to better manage the shared logics related to the ForceSandbox functionality. We are including such methods to the current plugin logic.

This PR does not include any new functionality, but decrease the techDebt maintaining both, Script-Security and Workflow-CPS Plugin.

Testing done

No new tests are required.
Tests implemented in #948 are already covering the new Scipt-Security logic.

The tests for the specific Script Security new functionality is already implemented in jenkinsci/script-security-plugin#586

We have executed some manual tests related to the Sandbox checkbox, and the behavior is the same than before the change

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