RFR: 8378057: CAccessibility roleKey and AWTAccessor.AccessibleBundleAccessor are Redundant

[Jeremy Wood]

This PR proposes replacing the native `roleKey` method with the `AWTAccessor.AccessibleBundleAccessor`. They appear to do the same thing.

I ran all the existing jtreg tests in the javax/accessibility folder and observed no new regressions (tested on Mac).

-------------

Commit messages:
 - 8378057: remove CAccessibility.roleKey

Changes: https://git.openjdk.org/jdk/pull/29868/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29868&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378057
  Stats: 22 lines in 2 files changed: 4 ins; 16 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29868.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29868/head:pull/29868

PR: https://git.openjdk.org/jdk/pull/29868