[jdk25u-dev] RFR: 8256289: java/awt/Focus/AppletInitialFocusTest/AppletInitialFocusTest1.java failed with "RuntimeException: Wrong focus owner: java.awt.Button[button1,41,36,56x23,label=Button1]"

[Roland Mesde]

Backporting JDK-8256289: java/awt/Focus/AppletInitialFocusTest/AppletInitialFocusTest1.java failed with "RuntimeException: Wrong focus owner: java.awt.Button[button1,41,36,56x23,label=Button1]".

This PR removes AppletInitialFocusTest1.java from the ProblemList.txt file after confirming intermittent focus failures no longer occur, and refactors tests to remove obsolete "Applet" references.

For parity with Oracle JDK.

Ran related tests on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

make test TEST=test/jdk/java/awt/Focus/InitialFocusTest

Results attached:

[windows-x64-specific-test.log](https://github.com/user-attachments/files/25218146/windows-x64-specific-test.log)
[macos-aarch64-specific-test.log](https://github.com/user-attachments/files/25218147/macos-aarch64-specific-test.log)
[linux-x64-specific-test.log](https://github.com/user-attachments/files/25218148/linux-x64-specific-test.log)
[linux-aarch64-specific-test.log](https://github.com/user-attachments/files/25218149/linux-aarch64-specific-test.log)

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Commit messages:
 - Backport 21c985f2d75401fd81fa5eaf1486b0be60246962

Changes: https://git.openjdk.org/jdk25u-dev/pull/247/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=247&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8256289
  Stats: 293 lines in 5 files changed: 146 ins; 147 del; 0 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/247.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/247/head:pull/247

PR: https://git.openjdk.org/jdk25u-dev/pull/247