task: #3625578 Update @vardot/varbase-e2e to 2.0.7 and gate the full AA accessibility audit

Issue: https://www.drupal.org/i/3625578

Changes

• Bumps to @vardot/varbase-e2e ^2.0.7, whose serious gate now fails on critical too.
• Retires the heading-order exemption in 07-01. That note said to gate the full AA audit once card heading levels were decoupled from visual size; #3625237 and #3625285 did that.
• Gates a full AA audit on all 14 shipped pages, the full check on six, and an any-impact gate on home.
• Adds 07-04 accessibility structure: document structure and identifiable controls across every page, plus element-scoped audits of the nav, breadcrumb and share block.
• Drops the required-marking check: the contact webform marks required fields with native required only, which is not a site defect.

Testing

07-quality green on a fresh Drupal CMS install of the recipe.

AI-Generated: Yes

Checkpoints:

• File an issue
• Addition/Change/Update/Fix
• Testing to ensure no regression
• Automated unit testing coverage
• Automated functional testing coverage
• UX/UI designer responsibilities
• Readability
• Accessibility
• Performance
• Security
• Developer Documentation
• User Guide Documentation
• Reviewed by human
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Release notes snippet
• Release