[57392] Make phone number optional

[tommasina-va]

When inputting contact information, make phone number optional to match the 526 paper form.

vets-json-schema PR: department-of-veterans-affairs/vets-json-schema#812

Summary

• This PR finishes the making of the phone number optional and includes some copy updates regarding phone number.

Related issue(s)

• Link to ticket created in va.gov-team repo
  department-of-veterans-affairs/va.gov-team#57392
• [merged] vets-json-schema PR: [57392] Make phone number optional vets-json-schema#806
• [new PR] vets-json-schema PR: [Bdex/57392 Disability Benefits Team] Make phone number optional - part 2 vets-json-schema#812
• [draft] vets-api PR: [bdex/57392 Disability Benefits team] Make phone number optional for form 526EZ vets-api#14407

Testing done

• I tested locally that phone number is not required to continue through the 526 form
• I tested that behavior stays the same when phone number is filled in
• I tested on staging that without a phone number, the contact information card is in edit mode, and with a phone number it's in review mode. I also tested that it's not required to continue through the form, and that nothing on the Review and Submit page was affected/changed.

Screenshots

Before	After

What areas of the site does it impact?

526EZ

Acceptance criteria

Quality Assurance & Testing

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Linting warnings have been addressed
• Documentation has been updated (link to documentation *if necessary)
• Screenshot of the developed feature is added
• Accessibility testing has been performed

Error Handling

• Browser console contains no warnings or errors.

Authentication

• Did you login to a local build and verify all authenticated routes work as expected with a test user

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?

[Mottie]

I'd recommend using the <va-telephone> web component to render the phone number

[Midge-dev]

LGTM