Write crash test for ARIA role case sensitivity

[rahimabdi]

@cookiecrook suggested writing a crash test (/wpt/accessibility) for testing ARIA role case sensitivity: w3c/aria#2548 (comment).

Standard WPT tests for this are being tracked here: #192.

[cookiecrook]

Ongoing discussion in the PR:

• Add crash test for ARIA role case-sensitive fallback wpt#53676

[spectranaut]

Discussed in the ARIA working group: https://www.w3.org/2025/07/10-aria-minutes.html#ebc6