[jdk17u-dev] RFR: 8306409: Open source AWT KeyBoardFocusManger, LightWeightComponent related tests

[Victor Rudometov]

Clean backport, new tests, low risk
Checked on macOS x64, linux x64, windows x64: tests pass

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Commit messages:
 - Backport 732179ca84ee1dab6530255c33de7f35cab649c2

Changes: https://git.openjdk.org/jdk17u-dev/pull/1370/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1370&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306409
  Stats: 615 lines in 6 files changed: 615 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1370.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1370/head:pull/1370

PR: https://git.openjdk.org/jdk17u-dev/pull/1370