RFR: JDK-8328398 : Convert java/awt/im/4490692/bug4490692.html applet test to main

[Harshitha Onkar]

Following test is converted from applet to main using PassFailJFrame.

The original test had ignore tag - **The fix for this problem was backed out for 5057184.  Remove this "ignore" tag when it is fixed again.**
I believe this was fixed and the test works correctly on Linux platforms, hence ignore tag has been removed.

This is a semi-automated test, the first check is manual and the 2nd one is automated. Details in the test instructions.

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Commit messages:
 - delete html file
 - instructions updated
 - test changes
 - test file moved

Changes: https://git.openjdk.org/jdk/pull/18402/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18402&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328398
  Stats: 241 lines in 3 files changed: 110 ins; 131 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18402.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18402/head:pull/18402

PR: https://git.openjdk.org/jdk/pull/18402