RFR: 8345286: Remove use of SecurityManager API from misc areas [v9]

[Jaikiran Pai]

> Can I please get a review of this change which removes usages of SecurityManager related APIs and some leftover related to SecurityManager changes?
> 
> This addresses https://bugs.openjdk.org/browse/JDK-8345286. Most of these changes are trivial. The `src/java.base/linux/classes/jdk/internal/platform/CgroupUtil.java` used to expose utility methods for dealing with SecurityManager permissions and it was called from a few places. That class is no longer needed with the clean up done in this PR.
> 
> No new tests have been introduced and tier testing is currently in progress.

Jaikiran Pai has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 15 commits:

 - merge latest from master branch
 - remove permission text from InnocuousThread
 - merge latest from master branch
 - remove changes to src/java.base/unix/classes/sun/security/provider/NativePRNG.java
 - remove unused import
 - replace remaining Paths.get() with Path.of() in the updated files
 - Update src/java.base/linux/classes/jdk/internal/platform/CgroupSubsystemController.java
   
   Co-authored-by: Severin Gehwolf <jerboaa at gmail.com>
 - Update src/java.base/linux/classes/jdk/internal/platform/cgroupv2/CgroupV2Subsystem.java
   
   Co-authored-by: Severin Gehwolf <jerboaa at gmail.com>
 - Path.of() instead of Paths.get() in CgroupV2Subsystem.java
 - remove unnecessary space
 - ... and 5 more: https://git.openjdk.org/jdk/compare/a3b58ee5...d53fe8ad

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

Changes: https://git.openjdk.org/jdk/pull/22478/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22478&range=08
  Stats: 269 lines in 22 files changed: 8 ins; 226 del; 35 mod
  Patch: https://git.openjdk.org/jdk/pull/22478.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22478/head:pull/22478

PR: https://git.openjdk.org/jdk/pull/22478