DFPL-11819- merge-to-master (#4956)

Co-authored-by: gauravchawla <gaurav-chawla@hotmail.com>

Jenkinsfile_nightly

@@ -79,7 +79,7 @@ withNightlyPipeline(type, product, component) {
 
   loadVaultSecrets(integrationTestSecrets)
 
-  //enableMutationTest()
+  enableMutationTest()
   enableFullFunctionalTest(240)
   // 'microsoft' and 'safari' to be returned to crossbrowser tests once FPLA-3172 improvements are complete
   //enableCrossBrowserTest(['chrome', 'firefox'])
@@ -90,7 +90,7 @@ withNightlyPipeline(type, product, component) {
     setupSecretsForIntegrationTests(pipelineConf)
   }
 
-  after('mutationTest') {
+  afterAlways('mutationTest') {
     archiveExtraFilesForIntegrationTests()
     teardownSecretsForIntegrationTests()
   }

service/build.gradle

@@ -445,27 +445,17 @@ integration {
 }
 
 pitest {
-  targetClasses = ['uk.gov.hmcts.reform.fpl.*']
-  pitestVersion = '1.15.0'
-  threads = 16
-  outputFormats = ['XML', 'HTML']
-  timestampedReports = false
-  excludedClasses = [
+  targetClasses.set(['uk.gov.hmcts.reform.fpl.*'])
+  threads.set(15)
+  outputFormats.set(['XML', 'HTML'])
+  excludedClasses.set([
     'uk.gov.hmcts.reform.fpl.config.*',
     'uk.gov.hmcts.reform.fpl.exceptions.*',
     'uk.gov.hmcts.reform.fpl.controllers.*',
     'uk.gov.hmcts.reform.fpl.testingsupport.*'
-  ]
-  junit5PluginVersion = '1.1.1'
-  logger.lifecycle("Runs PIT mutation Tests")
-  testSourceSets = [sourceSets.test]
-  mainSourceSets = [sourceSets.main]
-  enableDefaultIncrementalAnalysis = true
-  outputFormats = ['XML', 'HTML']
-  timestampedReports = true
-  mutationThreshold = 85
-  detectInlinedCode = true
-  timeoutConstInMillis = 30000
+  ])
+  timestampedReports.set(true)
+  mutationThreshold.set(75)
 }
 
 dependencyManagement {