profiler: set default CPU profiling interval to match duration

After testing this default on many high-volume internal workloads, we've
determined this default is safe for production. It's also important for
the code hotspots feature to be able to associated as many traces as
possible with profiling data.

profiler/options.go

@@ -45,7 +45,7 @@ const (
 	DefaultPeriod = time.Minute
 
 	// DefaultDuration specifies the default length of the CPU profile snapshot.
-	DefaultDuration = time.Second * 15
+	DefaultDuration = time.Minute
 
 	// DefaultUploadTimeout specifies the default timeout for uploading profiles.
 	// It can be overwritten using the DD_PROFILING_UPLOAD_TIMEOUT env variable