RFR: 8281941: Change CDS warning messages to use Unified Logging

Wed Mar 8 15:54:58 UTC 2023

As an addendum to previous commits that changed CDS logging, this replaces the remaining log messages with Unified logging. There are also old warning messages that used to be prefixed with UseSharedSpaces which have been updated along with their tests.

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Commit messages:
 - Fixed compilation error and tests
 - 8281941: Change CDS warning messages to use Unified Logging

Changes: https://git.openjdk.org/jdk/pull/12890/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12890&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281941
  Stats: 17 lines in 7 files changed: 0 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/12890.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12890/head:pull/12890

PR: https://git.openjdk.org/jdk/pull/12890