Investigate if the cancellation exception really need to be logged

[gayanper]

Problem Statement

Random error pop up in error log. May be we could ignore this from logging to keep the logs clean and make it easy to trouble shoot mining problems.

Any relate message in "Error Log" view

java.util.concurrent.CancellationException
	at org.eclipse.jface.internal.text.codemining.CancellationExceptionMonitor.isCanceled(CancellationExceptionMonitor.java:33)
	at org.testng.eclipse.ui.codemining.TestCodeMiningProvider.processElements(TestCodeMiningProvider.java:80)
	at org.testng.eclipse.ui.codemining.TestCodeMiningProvider.processElements(TestCodeMiningProvider.java:89)
	at org.testng.eclipse.ui.codemining.TestCodeMiningProvider.mineForTests(TestCodeMiningProvider.java:67)
	at org.testng.eclipse.ui.codemining.TestCodeMiningProvider.lambda$0(TestCodeMiningProvider.java:40)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1764)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1756)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)