[jdk21] RFR: 8307526: [JFR] Better handling of tampered JFR repository

Almost clean backport. Only real diff due to changes to JVM class: * `jvm.shouldRotateDisk()` instead of mainline's static `JVM.shouldRotateDisk()` ------------- Commit messages: - Backport 66d2736521611fbe7652356894d046c17d7cf743 Changes: https://git.openjdk.org/jdk21/pull/131/files Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=131&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8307526 Stats: 144 lines in 8 files changed: 102 ins; 8 del; 34 mod Patch: https://git.openjdk.org/jdk21/pull/131.diff Fetch: git fetch https://git.openjdk.org/jdk21.git pull/131/head:pull/131 PR: https://git.openjdk.org/jdk21/pull/131