minor: moves pitest suppressions under config

.ci/pitest-survival-check-xml.groovy

@@ -82,7 +82,7 @@ private static Set<String> getPitestProfiles() {
 private static int checkPitestReport(String profile, String flag) {
     final XmlParser xmlParser = new XmlParser()
     File mutationReportFile = null
-    final String suppressedMutationFileUri = ".${File.separator}.ci${File.separator}" +
+    final String suppressedMutationFileUri = ".${File.separator}config${File.separator}" +
             "pitest-suppressions${File.separator}${profile}-suppressions.xml"
 
     final File pitReports =

config/checkstyle_non_main_files_suppressions.xml

@@ -92,7 +92,7 @@
   <suppress id="lineLength" files=".ci[\\/]openjdk17-excluded.files"/>
 
   <!-- this file cannot be line wrapped, It contains a list of suppressions -->
-  <suppress id="lineLength" files=".ci[\\/]pitest-suppressions[\\/].*"/>
+  <suppress id="lineLength" files="config[\\/]pitest-suppressions[\\/].*"/>
 
   <!-- this file cannot be line wrapped, It contains a list of suppressions -->
   <suppress id="lineLength" files="config[\\/]error-prone-suppressions[\\/].*"/>