Fix casting to int in SLO-Generic

The SLO generics needs integer values. But in some cases converting to int does not work correctly.

For example, the value: "3970.00000000005" cannot be cast to an integer and the evaluation fails. In this case it is necessary to cast first to a float and then to an integer.

This solution is based on this comment and this comment.

theodolite/src/main/kotlin/theodolite/execution/BenchmarkExecutorImpl.kt

@@ -88,10 +88,12 @@ class BenchmarkExecutorImpl(
             this.loadGenerationDelay,
             this.afterTeardownDelay
         )
-        val from = Instant.now()
+        val from: Instant
 
         try {
             benchmarkDeployment.setup()
+            from = Instant.now()
+
             this.waitAndLog()
             if (mode == ExecutionModes.OPERATOR.value) {
                 eventCreator.createEvent(