Code completion after yield in switch expressions fixed.

[dbalek]

Fixing code completion after typing yield in switch expressions.

[mbien]

please label PRs accordingly. This PR is not running the right tests.
https://lists.apache.org/thread/3gyc3xvxjjh8osh5rd6k81lshtno0j0z

the description mentions what tests are added for each label
https://github.com/apache/netbeans/labels?q=%5Bci%5D

[mbien]

is this PR fixing the three failing testcases in java/java.completion org.netbeans.modules.java.completion.JavaCompletionTask117FeaturesTest under JDK 11+?

if yes, please sync again from master so that it contains the fix of #4756. After that, everything should be green again hopefully.

[mbien]

ok I am starting a fresh workflow run without a sync (please ignore lock conversation event, thats our secret restart button)

[mbien]

testCaseLabels 1,2,3 still failing, likely caused by #4746:

org.netbeans.junit.AssertionFileFailedError: Difference between /home/runner/work/netbeans/netbeans/java/java.completion/build/test/unit/work/o.n.m.j.c.J/cl/testCaseLabels_1.out and /home/runner/work/netbeans/netbeans/java/java.completion/build/test/unit/data/goldenfiles/org/netbeans/modules/java/completion/JavaCompletionTaskTest/1.8/AutoCompletion_CaseLabels_PatternMatchingSwitch_1.pass
diff: /home/runner/work/netbeans/netbeans/java/java.completion/build/test/unit/work/o.n.m.j.c.J/cl/testCaseLabels_1.diff
  at org.netbeans.junit.NbTestCase.assertFile(NbTestCase.java:742)
  at org.netbeans.junit.NbTestCase.assertFile(NbTestCase.java:792)
  at org.netbeans.modules.java.completion.CompletionTestBase.performTest(CompletionTestBase.java:110)
  at org.netbeans.modules.java.completion.JavaCompletionTask117FeaturesTest.testCaseLabels_1(JavaCompletionTask117FeaturesTest.java:55)
  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at org.netbeans.junit.NbTestCase.access$200(NbTestCase.java:77)
  at org.netbeans.junit.NbTestCase$2.doSomething(NbTestCase.java:476)
  at org.netbeans.junit.NbTestCase$1Guard.run(NbTestCase.java:402)
  at java.base/java.lang.Thread.run(Thread.java:829)