Update varbase-e2e to 2.0.7 and tighten the accessibility gate

Problem/Motivation

@vardot/varbase-e2e 2.0.7 adds a full accessibility check and new structure steps. The Horizon Aid accessibility tests do not use them yet, and the country, program, blog and event detail pages are not in the serious gate.

Proposed resolution

• Bump @vardot/varbase-e2e to ^2.0.7.
• Serious gate on every public page, detail pages included.
• Full accessibility check on the key pages.
• Move the structure checks into 07-04-accessibility-structure.feature, as in RightUp.

Remaining tasks

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

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Update @vardot/varbase-e2e to 2.0.7 and gate every public page on WCAG 2.2 AA.

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