RFR: 8378297: Remove AppContext from several Swing component and related classes [v4]

[Phil Race]

> Remove AppContext usage from several Swing classes that use it via  Swing utility (still used by other cases so can't remove that yet).
> 
> One ToolTipManager test for the AppContext is removed.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8378297

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29830/files
  - new: https://git.openjdk.org/jdk/pull/29830/files/9367a70f..8d7b5e24

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29830&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29830&range=02-03

  Stats: 6 lines in 1 file changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29830.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29830/head:pull/29830

PR: https://git.openjdk.org/jdk/pull/29830