JPERF-976: Decrease maxNodeCount to 2

Reduce the scope of the test to avoid `You are running out of disk space. The runner will stop working when the machine runs out of disk space` error.
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src/test/kotlin/com/atlassian/performance/tools/hardware/HardwareRecommendationEngineIT.kt

@@ -46,7 +46,7 @@ class HardwareRecommendationEngineIT {
                 // test the hard node limit kicks in before the (relaxed) behaviour limits
                 minApdexGain = 0.01,
                 minThroughputGain = TemporalRate(2.0, Duration.ofSeconds(1)),
-                maxNodeCount = 3
+                maxNodeCount = 2
             )
         }