[jdk21u-dev] RFR: 8353832: Opensource FontClass, Selection and Icon tests

[Satyen Subramaniam]

Backporting JDK-8353832: Opensource FontClass, Selection and Icon tests. Adds two FontClass tests, a Selection test, and an Icon test. Ran GHA Sanity Checks and new tests directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport 8c6b611f35af22af5b6c3eb663b30985857c1da3

Changes: https://git.openjdk.org/jdk21u-dev/pull/2435/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2435&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353832
  Stats: 350 lines in 4 files changed: 350 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2435.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2435/head:pull/2435

PR: https://git.openjdk.org/jdk21u-dev/pull/2435