RFR: 8343958: Remove security manager impl in java.lang.Process and java.lang.Runtime.exec

[Roger Riggs]

Refactor removing the dependencies on SecurityManager, doPrivileged, and AccessController.

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Depends on: https://git.openjdk.org/jdk/pull/21498

Commit messages:
 - Simplify the generation of the exception message.
 - Remove security manager impl in java.lang.Process and java.lang.Runtime.exec

Changes: https://git.openjdk.org/jdk/pull/22024/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22024&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343958
  Stats: 166 lines in 5 files changed: 0 ins; 106 del; 60 mod
  Patch: https://git.openjdk.org/jdk/pull/22024.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22024/head:pull/22024

PR: https://git.openjdk.org/jdk/pull/22024