[jdk18] RFR: 8278575: update jcmd GC.finalizer_info to list finalization status

[Stuart Marks]

A simple patch that I inadvertently omitted from the original integration.

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Commit messages:
 - Missing include
 - Update GC.finalizer_info dcmd

Changes: https://git.openjdk.java.net/jdk18/pull/33/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18&pr=33&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278575
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk18/pull/33.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18 pull/33/head:pull/33

PR: https://git.openjdk.java.net/jdk18/pull/33