superfluous stack trace produced when priting CacheException when annotation cache is disabled for a repository

[vladak]

When running the indexer with elevated log level, the following exception can be printed in the log for a repository that has annotation cache disabled:

2024-07-15 11:57:56.780+0200 FINEST t16415 AnalyzerGuru.lambda$findBySuffix$5: '/foo/bar.c': chosen by suffix: CAnalyzerFactory
2024-07-15 11:57:56.780+0200 FINE t16415 DefaultIndexChangedListener.fileAdd: Add: '/foo/bar.c' (CAnalyzer)
2024-07-15 11:57:56.787+0200 FINER t16416 IndexDatabase.createAnnotationCache: failed to create annotation
org.opengrok.indexer.history.CacheException: repository {dir='/foo',type=Mercurial,historyCache=on,renamed=true,merge=true,annotationCache=off} does not allow to create annotation cache for '/foo/bar.c'
        at org.opengrok.indexer.history.HistoryGuru.createAnnotationCache(HistoryGuru.java:1174)
        at org.opengrok.indexer.index.IndexDatabase.createAnnotationCache(IndexDatabase.java:1307)
        at org.opengrok.indexer.index.IndexDatabase.addFile(IndexDatabase.java:1286)
        at org.opengrok.indexer.index.IndexDatabase.lambda$indexParallel$9(IndexDatabase.java:1920)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:834)

The stack trace for the exception is superfluous in this case and can be omitted. The CacheException can be thrown from createAnnotationCache() also based on IOException where the stack trace could be useful so these two cases need to be distinguished.