MT#16399 Add timing to XML output from tool 'prove'

It allows to track test results better.

Change-Id: Iec004def53cea5a8bab96206a67cc3e33029cd55

t/testrunner

@@ -12,7 +12,7 @@ if [ -d /results ] ; then
   RESULTS="/results"
 
   cd "/code"
-  prove --formatter TAP::Formatter::JUnit -l -I/code/lib | \
+  prove --timer --formatter TAP::Formatter::JUnit -l -I/code/lib | \
     tee -a "${RESULTS}/results.xml" || RC=$?
 else
   # Running locally in Docker