RFR: 8376232: Remove AppContext from Swing synth related classes

[Alexander Zvegintsev]

On Fri, 23 Jan 2026 20:58:53 GMT, Phil Race <prr at openjdk.org> wrote:

> Remove AppContext from Swing's synth related classes.
> 2 tests that check this code uses AppContext are removed.

Marked as reviewed by azvegint (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29394#pullrequestreview-3706694023