refactor: #3621381 Drop the redundant local access-denied step

Issue: #3621381 Remove the local "am denied access to" step, now redundant with @vardot/varbase-e2e 2.0.4

Why

@vardot/varbase-e2e 2.0.4 ships the same step this recipe defined locally. Nothing was broken yet — no scenario uses that sentence, so the run was clean — but it is a duplicate waiting to bite: the same local step took out 4 scenarios in Varbase AI Figma.

Then I am denied access to "/admin/config/ai/figma"

• Ours: tests/step-definitions/ai-figma.steps.js:89
• The library's: navigation.steps.js:264

What changed

• Deleted the local step and its doc block from tests/step-definitions/ai-figma.steps.js.
• Dependency ^2 → ^2.0.4.
• No feature file changes.

Keep the library one: it passes on any refusal a site can give (403, 404, an access-denied page, a redirect to the log-in form) and it is documented. Ours only checked the status code.

Verified

npx cucumber-js --dry-run: 6 scenarios, 91 steps, nothing ambiguous, nothing undefined. The browser suite needs a live site, so CI confirms the rest.

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