RFR: 8307193: Several Swing jtreg tests use class.forName on L&F classes [v2]

[Prasanta Sadhukhan]

> Opensource couple RTL tests

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  spacing

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19341/files
  - new: https://git.openjdk.org/jdk/pull/19341/files/e9c1da0e..9f26b8f0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19341&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19341&range=00-01

  Stats: 6 lines in 2 files changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19341.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19341/head:pull/19341

PR: https://git.openjdk.org/jdk/pull/19341