Avoid duplicate measurements in the timing plots for apk test runs with BundleAssemblies=True

[radekdoulik]

After fixing the plots I noticed we have duplicate values in the measurements. Like these in TestResult-Mono.Android_Tests-times.csv:

last-Debug,JNI.init-Debug,init-Debug,NUnit.results-Debug,last-Release,JNI.init-Release,init-Release,NUnit.results-Release,last-Release,JNI.init-Release,init-Release,NUnit.results-Release
3820,1200,1200,13385,2152,657,657,10461,2152,657,657,10461

Notice the duplicates for Release configuration.