Fix our coreclr job definition

The intent was to create a debug and release leg for our CoreClr tests.
Our groovy code though gave both jobs the same name and Jenkins let the
last one win. Hence we've only ever been running release CoreClr legs.

This changes the definition to give each a separate name.

netci.groovy

@@ -83,7 +83,7 @@ commitPullList.each { isPr ->
 // Windows CoreCLR
 commitPullList.each { isPr ->
   ['debug', 'release'].each { configuration ->
-    def jobName = Utilities.getFullJobName(projectName, "windows_coreclr_test", isPr)
+    def jobName = Utilities.getFullJobName(projectName, "windows_coreclr_${configuration}", isPr)
     def myJob = job(jobName) {
       description("Windows CoreCLR unit tests")
             steps {