[jdk21u-dev] RFR: 8341072: Open source several AWT Canvas and Rectangle related tests

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport f6fe5eaf1a24ba083e7ecf28b02290020ccab142

Changes: https://git.openjdk.org/jdk21u-dev/pull/1639/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1639&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341072
  Stats: 745 lines in 5 files changed: 745 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1639.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1639/head:pull/1639

PR: https://git.openjdk.org/jdk21u-dev/pull/1639