RFR: 8344992: Remove Security Manager dependencies from java.security.cert API and implementations

[Sean Mullan]

Now that JEP 486 has been integrated, `java.security.cert` API and impl dependencies on  `AccessController.doPrivileged` can be removed.

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Commit messages:
 - Initial cleanup.

Changes: https://git.openjdk.org/jdk/pull/22372/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22372&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344992
  Stats: 142 lines in 12 files changed: 5 ins; 69 del; 68 mod
  Patch: https://git.openjdk.org/jdk/pull/22372.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22372/head:pull/22372

PR: https://git.openjdk.org/jdk/pull/22372