RFR: 8340560: Open Source several AWT/2D font and rendering tests

[Phil Race]

Open sourcing some rendering tests.

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Commit messages:
 - 8340560

Changes: https://git.openjdk.org/jdk/pull/21192/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21192&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340560
  Stats: 578 lines in 4 files changed: 578 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21192.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21192/head:pull/21192

PR: https://git.openjdk.org/jdk/pull/21192