VACMS-14307 Contain Veteran banner in main element

[randimays]

Description

The div that contains the Veteran portraits on Benefits Hub landing pages (i.e. /health-care) is not contained by a landmark (the <main> element). This moves it into that element.

• All page content MUST be contained by landmarks - div.veteran-banner va.gov-cms#14307

Tugboat to review: https://web-1wtvtqpercm3v5ybkwhzw7ai8277jd1u.demo.cms.va.gov/health-care/

Testing done & Screenshots

QA steps

1. Navigate to /health-care
2. Inspect the Veteran banner at the bottom of the page
3. Confirm the .veteran-banner element is contained within main
4. Run the axe DevTools scan (Chrome plugin)
5. Validate that the All page content should be contained by landmarks category either doesn't exist or does not contain veteran-banner if it does exist

Acceptance criteria

• As a screen reader user, I want to navigate the content of the page by landmark regions.

[chriskim2311]

LGTM

[laflannery]

Confirmed that the error is no longer being flagged by axe and the HTML looks good!