RFR: 8339902: Open source couple TextField related tests [v6]

[Alexander Zuev]

> Clean up and open source five TextField related tests: 
> java/awt/TextField/CaretPositionTest;
> java/awt/TextField/SetBoundsTest;
> java/awt/TextField/SetEchoCharTest4;
> java/awt/TextField/SetPasswordTest;
> java/awt/TextField/ZeroEchoCharTest

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

  Update test/jdk/java/awt/TextField/CaretPositionTest/CaretPositionTest.java
  
  Co-authored-by: Harshitha Onkar <harshitha.onkar at oracle.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21026/files
  - new: https://git.openjdk.org/jdk/pull/21026/files/e4804501..a9e439a4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21026&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21026&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21026.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21026/head:pull/21026

PR: https://git.openjdk.org/jdk/pull/21026