Fix RemoveInstanceOfPatternMatch crash on Groovy files#828
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Exclude Groovy files from RemoveInstanceOfPatternMatch recipe using GroovyFileChecker precondition. The recipe relies on visitCompilationUnit(J.CompilationUnit) to initialize variableUsage, which is never called for Groovy's G.CompilationUnit, causing a NullPointerException when processing Groovy files like build.gradle. Fixes #2
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Exclude Groovy files from RemoveInstanceOfPatternMatch recipe using GroovyFileChecker precondition. The recipe relies on visitCompilationUnit(J.CompilationUnit) to initialize variableUsage, which is never called for Groovy's G.CompilationUnit, causing a NullPointerException when processing Groovy files like build.gradle.