RFR: 8316324: Opensource five miscellaneous Swing tests [v2]

[Alexander Zuev]

> Clean up and opensource five tests.

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Removing image file as not needed, generating ImageIcon instead;
  Moved test file from the dedicated folder siince it is no longer needed;
  Removed setVidible(false) calls before disposal of the components;

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18443/files
  - new: https://git.openjdk.org/jdk/pull/18443/files/cea98042..5eca231d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18443&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18443&range=00-01

  Stats: 187 lines in 4 files changed: 97 ins; 90 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18443.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18443/head:pull/18443

PR: https://git.openjdk.org/jdk/pull/18443