[jdk25u-dev] RFR: 8364756: JFR: Improve slow tests

[Roland Mesde]

Backporting JDK-8364756: JFR: Improve slow tests.

This PR reduces JFR test execution time by optimizing the slowest tests for both CPU usage and duration.

For parity with Oracle JDK.

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

make test TEST=test/jdk/jdk/jfr/api/consumer/streaming/TestFilledChunks.java
make test TEST=test/jdk/jdk/jfr/api/consumer/streaming/TestStartMultiChunk.java
make test TEST=test/jdk/jdk/jfr/event/runtime/StressJavaMonitorEvents.java
make test TEST=test/jdk/jdk/jfr/jmx/streaming/TestMaxSize.java
make test TEST=test/jdk/jdk/jfr/jmx/streaming/TestRemoteDump.java
make test TEST=test/jdk/jdk/jfr/jvm/TestWaste.java
make test TEST=test/jdk/jdk/jfr/startupargs/TestMultipleStartupRecordings.java

Results attached:

[macos-aarch64-specific-test.log](https://github.com/user-attachments/files/25299475/macos-aarch64-specific-test.log)
[macos-aarch64-specific-2-test.log](https://github.com/user-attachments/files/25299476/macos-aarch64-specific-2-test.log)
[macos-aarch64-specific-3-test.log](https://github.com/user-attachments/files/25299478/macos-aarch64-specific-3-test.log)
[macos-aarch64-specific-4-test.log](https://github.com/user-attachments/files/25299479/macos-aarch64-specific-4-test.log)
[macos-aarch64-specific-5-test.log](https://github.com/user-attachments/files/25299480/macos-aarch64-specific-5-test.log)
[macos-aarch64-specific-6-test.log](https://github.com/user-attachments/files/25299481/macos-aarch64-specific-6-test.log)
[macos-aarch64-specific-7-test.log](https://github.com/user-attachments/files/25299482/macos-aarch64-specific-7-test.log)
[linux-aarch64-specific-test.log](https://github.com/user-attachments/files/25299612/linux-aarch64-specific-test.log)
[linux-aarch64-specific-2-test.log](https://github.com/user-attachments/files/25299613/linux-aarch64-specific-2-test.log)
[linux-aarch64-specific-3-test.log](https://github.com/user-attachments/files/25299614/linux-aarch64-specific-3-test.log)
[linux-aarch64-specific-4-test.log](https://github.com/user-attachments/files/25299615/linux-aarch64-specific-4-test.log)
[linux-aarch64-specific-5-test.log](https://github.com/user-attachments/files/25299616/linux-aarch64-specific-5-test.log)
[linux-aarch64-specific-6-test.log](https://github.com/user-attachments/files/25299617/linux-aarch64-specific-6-test.log)
[linux-aarch64-specific-7-test.log](https://github.com/user-attachments/files/25299618/linux-aarch64-specific-7-test.log)
[linux-x64-specific-test.log](https://github.com/user-attachments/files/25299625/linux-x64-specific-test.log)
[linux-x64-specific-2-test.log](https://github.com/user-attachments/files/25299626/linux-x64-specific-2-test.log)
[linux-x64-specific-3-test.log](https://github.com/user-attachments/files/25299627/linux-x64-specific-3-test.log)
[linux-x64-specific-4-test.log](https://github.com/user-attachments/files/25299628/linux-x64-specific-4-test.log)
[linux-x64-specific-5-test.log](https://github.com/user-attachments/files/25299629/linux-x64-specific-5-test.log)
[linux-x64-specific-6-test.log](https://github.com/user-attachments/files/25299630/linux-x64-specific-6-test.log)
[linux-x64-specific-7-test.log](https://github.com/user-attachments/files/25299631/linux-x64-specific-7-test.log)
[windows-x64-specific-test.log](https://github.com/user-attachments/files/25299673/windows-x64-specific-test.log)
[windows-x64-specific-2-test.log](https://github.com/user-attachments/files/25299674/windows-x64-specific-2-test.log)
[windows-x64-specific-3-test.log](https://github.com/user-attachments/files/25299675/windows-x64-specific-3-test.log)
[windows-x64-specific-4-test.log](https://github.com/user-attachments/files/25299676/windows-x64-specific-4-test.log)
[windows-x64-specific-5-test.log](https://github.com/user-attachments/files/25299677/windows-x64-specific-5-test.log)
[windows-x64-specific-6-test.log](https://github.com/user-attachments/files/25299678/windows-x64-specific-6-test.log)
[windows-x64-specific-7-test.log](https://github.com/user-attachments/files/25299679/windows-x64-specific-7-test.log)

-------------

Commit messages:
 - Backport 87d734012e3130501bfd37b23cee7f5e0a3a476f

Changes: https://git.openjdk.org/jdk25u-dev/pull/263/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=263&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364756
  Stats: 28 lines in 7 files changed: 8 ins; 8 del; 12 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/263.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/263/head:pull/263

PR: https://git.openjdk.org/jdk25u-dev/pull/263