5.x - FIO-8426: changes required for eSignature

[TanyaGashtold]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-8426

Description

What changed?

separated some code as new methods

Checklist:

• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (if applicable)
• [x] My changes generate no new warnings
• [ ] My changes include tests that prove my fix is effective (or that my feature works as intended)
• [x] New and existing unit/integration tests pass locally with my changes
• [x] Any dependent changes have corresponding PRs that are listed above

[johnformio]

LGTM. Would like to get @brendanbond to take a look as well.