RFR: 8316240: Open source several add/remove MenuBar manual tests

[Alexander Zvegintsev]

Open sourcing several MenuBar manual tests

java/awt/MenuBar/AddRemoveMenuBarTests/AddRemoveMenuBarTest_1.java
java/awt/MenuBar/AddRemoveMenuBarTests/AddRemoveMenuBarTest_2.java
java/awt/MenuBar/AddRemoveMenuBarTests/AddRemoveMenuBarTest_3.java
java/awt/MenuBar/AddRemoveMenuBarTests/AddRemoveMenuBarTest_4.java

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Commit messages:
 - 8316240: Open source several add/remove MenuBar manual tests

Changes: https://git.openjdk.org/jdk/pull/15800/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15800&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316240
  Stats: 521 lines in 4 files changed: 521 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15800.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15800/head:pull/15800

PR: https://git.openjdk.org/jdk/pull/15800