RFR: 8158801: [TEST_BUG] Mixing tests fail because of focus workaround trick

[Khalid Boulanouare]

Many Mixing tests failed because the work around click lands on the minimizing area in the window control and causes the tests to fail.

This fix changes the width of base frames which allows most of tests to pass.

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Commit messages:
 - Problem list files for Mac OS only
 - Removes passed tests from problem list
 - Changes Frame width to 300, uses protected constants for all base tests frame sizes

Changes: https://git.openjdk.org/jdk/pull/25971/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25971&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8158801
  Stats: 42 lines in 7 files changed: 3 ins; 30 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/25971.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25971/head:pull/25971

PR: https://git.openjdk.org/jdk/pull/25971