93461: Add stamps and digital signature to VBA214140

[derekhouck]

Summary

• This work is behind a feature toggle (flipper): NO
• This is the final PR spawned from Create model class for Employment-History questionnaire va.gov-team#93461 due to LOC limitations.
• Adds instance methods relating to signature, date of signature, and digital stamps to VBA214140.
• Maps all of the above to the PDF template.

Related issue(s)

• Create model class for Employment-History questionnaire va.gov-team#93461

Testing done

• New code is covered by unit tests
• Unit tests for all new instance methods
• Added 21-4140 to the specs for scrubbing PII in the event of a failure

What areas of the site does it impact?

At the moment, none. It will ultimately impact the Simple Forms API, adding support for the 21-4140 form.

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature

Requested Feedback

(OPTIONAL)What should the reviewers know in addition to the above. Is there anything specific you wish the reviewer to assist with. Do you have any concerns with this PR, why?

[derekhouck]

Coordinates originate from the bottom left corner of the page.

[ryguyk]

Nice to see this last piece of the puzzle get completed.

[stevenjcumming]

The post should be in the examples (it)

[derekhouck]

Can you expand a little bit on the reason why? Is there a technical RSpec problem with the post request being in a before block, or is it an human-centered organizational/comprehension issue?