RFR: JDK-8328012 : Convert InputMethod (/java/awt/im) applet tests to main [v6]

[Harshitha Onkar]

> Following InputMethod applet tests are converted to main using PassFailJFrame
> 
> 1. java/awt/im/8132503/bug8132503.java (Renamed to PinyinIMFullstopTest.java)
> 2. java/awt/im/8148984/bug8148984.java (Renamed to PinyinIMCommaTest.java) 
> 
> - test instructions are updated to make to more clear
> - tests renamed 
> - 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:

  OS check removed

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18251/files
  - new: https://git.openjdk.org/jdk/pull/18251/files/19fa3fe8..0580da43

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18251&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18251&range=04-05

  Stats: 18 lines in 2 files changed: 0 ins; 14 del; 4 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