fix(internal-api): Fix test name uniqueness

Author: PerfectSlayer

internal-api/src/test/groovy/datadog/trace/api/telemetry/MetricCollectorTest.groovy

@@ -4,7 +4,7 @@ import spock.lang.Specification
 
 class MetricCollectorTest extends Specification {
 
-  void 'test metric equality'() {
+  void 'test metric equality #iterationIndex'() {
     when:
     final sameMetric = first == second