RFR: 8316025: Use testUI() method of PassFailJFrame.Builder in FileChooserSymLinkTest.java

[Alexey Ivanov]

This update to `FileChooserSymLinkTest.java` demonstrates the usage of the `testUI` method of the `PassFailJFrame.Builder` class to streamline creating the UI for manual tests.

The [`main` method](https://github.com/aivanov-jdk/jdk/blob/cb1835527d718226f1c6fdd85ff5986703ea356f/test/jdk/javax/swing/JFileChooser/FileChooserSymLinkTest.java#L110-L118) is a simple sequence of calls:


    public static void main(String[] args) throws Exception {
        PassFailJFrame.builder()
                      .instructions(INSTRUCTIONS)
                      .rows(35)
                      .columns(50)
                      .testUI(FileChooserSymLinkTest::createTestUI)
                      .build()
                      .awaitAndCheck();
    }


It's the most streamlined way of creating a manual test.

This change depends on #15665 and [JDK-8294156](https://bugs.openjdk.org/browse/JDK-8294156) as well as #15661, both of which depend on #15660.

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

Depends on: https://git.openjdk.org/jdk/pull/15665

Commit messages:
 - Use testUI() and builder pattern to create test UI

Changes: https://git.openjdk.org/jdk/pull/15666/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15666&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316025
  Stats: 110 lines in 1 file changed: 52 ins; 47 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/15666.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15666/head:pull/15666

PR: https://git.openjdk.org/jdk/pull/15666