[CALCITE-5571] Remove org.jetbrains.annotations from java source code #3102
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The project primarily uses checkerframework annotations (org .checkerframework.checker.nullness.qual) for specifying nullability; not org.jetbrains.annotations.
To keep things consistent and also avoid mixing up annotations from different providers in the future, this commit removes the last references to org.jetbrains.annotations and excludes the org.jetbrains:annotations dependency from the build to avoid accidentally using such annotations in the future.