RFR: 8325851: Hide PassFailJFrame.Builder constructor

[Alexey Ivanov]

The `Builder` class in `PassFailJFrame` is public and has a public constructor. At the same time, a better design would be to hide all the Builder constructors and rely on the `builder()` method which returns an instance of the `Builder` class.

This PR makes the constructor of the `Builder` class private so that it's not accessible directly.

Use `PassFailJFrame.builder()` to get an instance of the builder and configure parameters of `PassFailJFrame`.

I updated all the tests which used the constructor directly by calling `new PassFailJFrame.Builder()`.

I converted a few tests to use the `testUI`, which greatly simplifies the test code. This change also removes flickering of the test UI.

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Commit messages:
 - Minor updates to createUI in ComboPopupBug
 - Use testUI in ComboPopupBug
 - Use testUI in DefaultCloseOperation and reduce the number of columns
 - Use testUI in LightweightCliprect
 - Remove unused EventQueue import
 - Use testUI in DefaultSizeTest
 - Use testUI in FrameRepackTest
 - Use testUI in MultimonVImage
 - Use testUI in AddRemoveMenuBar_{1..4}
 - Remove unused EventQueue import
 - ... and 5 more: https://git.openjdk.org/jdk/compare/0a6e64e2...91361e52

Changes: https://git.openjdk.org/jdk/pull/18206/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18206&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325851
  Stats: 242 lines in 21 files changed: 14 ins; 118 del; 110 mod
  Patch: https://git.openjdk.org/jdk/pull/18206.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18206/head:pull/18206

PR: https://git.openjdk.org/jdk/pull/18206