RFR: 8281284 : Write JSlider accessibility test

[lawrence.andrews]

This testcase covers both old and new api ( api added in jdk17  getAccessibleAction(), getAccessibleActionCount() , getAccessibleActionDescription )

@shurymury 
@savoptik

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Commit messages:
 - 8281284 : Write JSlider accessibility test

Changes: https://git.openjdk.java.net/jdk/pull/7355/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7355&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281284
  Stats: 247 lines in 1 file changed: 247 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7355.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7355/head:pull/7355

PR: https://git.openjdk.java.net/jdk/pull/7355