Fix build scan logic to support folder nested Jenkins job names

Signed-off-by: Mark Vieira <portugee@gmail.com>

gradle/build-scan.gradle

@@ -37,11 +37,11 @@ buildScan {
     // Parse job name in the case of matrix builds
     // Matrix job names come in the form of "base-job-name/matrix_param1=value1,matrix_param2=value2"
     def splitJobName = jobName.split('/')
-    if (splitJobName.length == 2) {
-      tag splitJobName[0]
-      tag splitJobName[1]
-      value 'Job Name', splitJobName[0]
-      def matrixParams = splitJobName[1].split(',')
+    if (splitJobName.length > 1 && splitJobName.last() ==~ /^([a-zA-Z0-9_\-]+=[a-zA-Z0-9_\-]+,?)+$/) {
+      def baseJobName = splitJobName.dropRight(1).join('/')
+      tag baseJobName
+      value 'Job Name', baseJobName
+      def matrixParams = splitJobName.last().split(',')
       matrixParams.collect { it.split('=') }.each { param ->
         value "MATRIX_${param[0].toUpperCase()}", param[1]
       }