[FLINK-20651] Add suppressions for breakage after google-java-format formatting

The reformatting increases file length for some files.

tools/maven/suppressions.xml

@@ -32,6 +32,11 @@ under the License.
 		<suppress files="NoticeFileChecker.java" checks="Regexp"/>
 		<suppress files="NoticeFileChecker.java" checks="IllegalImport"/>
 
+		<suppress files="JoinOperator.java" checks="FileLength"/>
+		<suppress files="WindowOperatorTest.java" checks="FileLength"/>
+		<suppress files="WindowOperatorContractTest.java" checks="FileLength"/>
+		<suppress files="NFAITCase.java" checks="FileLength"/>
+
 		<suppress files="org[\\/]apache[\\/]flink[\\/]formats[\\/]avro[\\/]generated[\\/].*.java" checks="[a-zA-Z0-9]*"/>
 		<suppress files="org[\\/]apache[\\/]flink[\\/]formats[\\/]parquet[\\/]generated[\\/].*.java" checks="[a-zA-Z0-9]*"/>
 		<!-- Sometimes we have to temporarily fix very long, different formatted Calcite files. -->