RFR: 8328482: Convert and Open source few manual applet test to main based [v2]

[Tejesh R]

> Convert and open source these manual applet test to main based:
> java/awt/Frame/MegaIconTest/MegaIconTest.html
> java/awt/Frame/FrameMaximizedTest/FrameMaximizedTest.html
> java/awt/Frame/FrameMinimizeTest/FrameMinimizeTest.html
> java/awt/Frame/SizeMinimizedTest/SizeMinimizedTest.html

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  Updated regtesthelpers path

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18448/files
  - new: https://git.openjdk.org/jdk/pull/18448/files/f2a21554..433086cb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18448&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18448&range=00-01

  Stats: 4 lines in 4 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18448.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18448/head:pull/18448

PR: https://git.openjdk.org/jdk/pull/18448