VAGOV-TEAM-100670: Removes sidebar placeholder and two-column layout

[ryguyk]

Description

This PR removes the sidebar placeholder put in recently, as it has been removed from updated designs.

Closes department-of-veterans-affairs/va.gov-team#100670

Testing done

• Functional test updated.
• Manual testing to ensure sidebar is no longer present on Form Builder pages.

Screenshots

Before

After

QA steps

As a user with role Form Builder user:

1. Navigate to /form-builder.
   • Validate that the two-column layout is gone.
   • Validate that the sidebar placeholder no longer appears.
   • Validate that the page still "looks" correct everywhere else.

Definition of Done

• Documentation has been updated, if applicable.
• Tests have been added if necessary.
• Automated tests have passed.
• Code Quality Tests have passed.
• Acceptance Criteria in related issue are met.
• Manual Code Review Approved.
• If there are field changes, front end output has been thoroughly checked.

Select Team for PR review

• CMS Team
• Public websites
• Facilities
• User support
• Accelerated Publishing
• Form Engine

Is this PR blocked by another PR?

• DO NOT MERGE

Does this PR need review from a Product Owner

• Needs PO review

CMS user-facing announcement

Is an announcement needed to let editors know of this change?

• Yes, and it's written in issue ____ and queued for publication.
  • Merge and ping the UX writer so they are ready to publish after deployment
• Yes, but it hasn't yet been written
  • Don't merge yet -- ping the UX writer to write and queue content
• No announcement is needed for this code change.
  • Merge & carry on unburdened by announcements

[github-actions]

Checking composer.lock changes...

[github-actions]

Checking composer.lock changes...

[va-cms-bot]

Cypress Accessibility Violations

/test-data-dolores

ID: button-name
Impact: critical
Tags: cat.name-role-value, wcag2a, wcag412, section508, section508.22.a, TTv5, TT6.a, EN-301-549, EN-9.4.1.2, ACT
Description: Ensure buttons have discernible text
Help: Buttons must have discernible text
Nodes:

• HTML: <button class="proofing-element-help" role="tooltip" data-proofing-help-title="About 'Page introduction' field" data-proofing-help="Add an introduction that helps visitors understand if information on the page is relevant to them."> <span aria-hidden="true">i</span> </button>
  Impact: critical
  Target: .field--name-field-intro-text-limited-html > .field__label > .proofing-element-help[role="tooltip"]
  Summary: Fix any of the following:
  Element does not have inner text that is visible to screen readers
  aria-label attribute does not exist or is empty
  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
  Element has no title attribute
  Element does not have an implicit (wrapped) <label>
  Element does not have an explicit <label>
  Element's default semantics were not overridden with role="none" or role="presentation"

• HTML: <button class="proofing-element-help" role="tooltip" data-proofing-help-title="About 'Generate a table of contents from major headings' field" data-proofing-help="By checking this box, all h2's below this point on the page will be linked with with anchor links. This helps users navigate content on very long pages. Do not check this box unless there is at least 2 h2's on the page.">
  Impact: critical
  Target: .field--name-field-table-of-contents-boolean > .field__label > .proofing-element-help[role="tooltip"]
  Summary: Fix any of the following:
  Element does not have inner text that is visible to screen readers
  aria-label attribute does not exist or is empty
  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
  Element has no title attribute
  Element does not have an implicit (wrapped) <label>
  Element does not have an explicit <label>
  Element's default semantics were not overridden with role="none" or role="presentation"

• HTML: <button class="proofing-element-help" role="tooltip" data-proofing-help-title="About 'Main content' field" data-proofing-help="The main body of the page, which appears below the featured content."> <span aria-hidden="true">i</span> </button>
  Impact: critical
  Target: button[data-proofing-help-title="About 'Main content' field"]
  Summary: Fix any of the following:
  Element does not have inner text that is visible to screen readers
  aria-label attribute does not exist or is empty
  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
  Element has no title attribute
  Element does not have an implicit (wrapped) <label>
  Element does not have an explicit <label>
  Element's default semantics were not overridden with role="none" or role="presentation"

[derekhouck]

LGTM

[derekhouck]

I appreciate you cleaning up the CSS. Way too easy to forget about this and leave it there indefinitely.