test: add e2e tests for new Landmarks auto-pass behavior

[dbjorge]

Description of changes

Adds new end to end tests that verify the auto-pass-on-no-landmarks behavior introduced in #2644. Updates the product code to add a new data-automation-id, no UI impact.

Pull request checklist

• Addresses an existing issue: e2e test for behavior in Landmarks requirements confusing for target page with no (or multiple) main landmarks #2521
• Ran yarn fastpass
• Added/updated relevant unit test(s) (and ran yarn test)
• Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• PR title AND final merge commit title both start with a semantic tag (fix:, chore:, feat(feature-name):, refactor:). See CONTRIBUTING.md.
• [n/a] (UI changes only) Added screenshots/GIFs to description above
• [n/a] (UI changes only) Verified usability with NVDA/JAWS