RFR: 8372592: Adjust logger usage in java2d tests

[Phil Race]

We had a previous mysterious failure that looks like it was due to a logger being gc'd.
To prevent that update all the marlin tests to use a logger stored in a static.
The 'final' modifier probably isn't necessary for this but is harmless, I'm doing the minimum here
so I don't want to go change log -> LOG everywhere just because its now final.

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Commit messages:
 - 8372592

Changes: https://git.openjdk.org/jdk/pull/28778/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28778&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372592
  Stats: 19 lines in 4 files changed: 11 ins; 8 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28778.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28778/head:pull/28778

PR: https://git.openjdk.org/jdk/pull/28778