RFR: JDK-8328012 : Convert InputMethod (/java/awt/im) applet tests to main [v3]

[Harshitha Onkar]

> The following InputMethod test, bug8148984.java is converted to main using PassFailJFrame.
> 
> - test instructions updated to make to more clear
> - test renamed to PinyinIMCommaTest
> - moved one directory above - /java/awt/im/
> - html file deleted.
> 
> Two tests are updated as part of this PR as they are similar, details here https://github.com/openjdk/jdk/pull/18251#issuecomment-1992577598

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  added Fullstop test case

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18251/files
  - new: https://git.openjdk.org/jdk/pull/18251/files/2253bf68..e82034f4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18251&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18251&range=01-02

  Stats: 171 lines in 3 files changed: 86 ins; 85 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18251.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18251/head:pull/18251

PR: https://git.openjdk.org/jdk/pull/18251