RFR: 8378297: Remove AppContext from several Swing component and related classes [v2]

[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

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29830/files
  - new: https://git.openjdk.org/jdk/pull/29830/files/2b813442..a4949913

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29830&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29830&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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