RFR: JDK-8320335: Deprecate `RegisterFinalizersAtInit` option and code

[Dan Heidinga]

Deprecate the -XX:[+-]RegisterFinalizersAtInit option in JDK22. Goal is complete removal by JDK24.

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Commit messages:
 - JDK-8320335: Deprecate `RegisterFinalizersAtInit` option and code

Changes: https://git.openjdk.org/jdk/pull/16747/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16747&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320335
  Stats: 3 lines in 2 files changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16747.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16747/head:pull/16747

PR: https://git.openjdk.org/jdk/pull/16747