RFR: 8281284 : Write JSlider accessibility test [v2]

[lawrence.andrews]

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

lawrence.andrews has updated the pull request incrementally with one additional commit since the last revision:

  Added @key headful

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7355/files
  - new: https://git.openjdk.java.net/jdk/pull/7355/files/410441a8..0e1f269f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7355&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7355&range=00-01

  Stats: 1 line in 1 file changed: 1 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