RFR: 8374383: Update the copyright year to 2025 in the remaining files under test/ where it was missed

[Sergey Bylokhov]

The copyright year in test/* files updated in 2025 has been bumped to 2025.

Updates to some tests in the test/langtools/jdk/javadoc/ group are skipped because some tests depend on exact output.

The next command can be run (on top of this PR) to verify that each file had prior commits in 2025:

`git diff origin/master --name-only | while read f; do git log origin/master --since="2025-01-01" --oneline -- "$f" | head -1 | grep -q . || echo "NOT IN 2025: $f"; done`

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Commit messages:
 - revert langtools/jdk/javadoc/doclet/testSourceTab/SingleTab
 - 8374383: Update the copyright year to 2025 in the remaining files under test/ where it was missed.

Changes: https://git.openjdk.org/jdk/pull/29006/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29006&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374383
  Stats: 76 lines in 76 files changed: 0 ins; 0 del; 76 mod
  Patch: https://git.openjdk.org/jdk/pull/29006.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29006/head:pull/29006

PR: https://git.openjdk.org/jdk/pull/29006