fix unexpected TimeSeriesLimitReached after HistogramLimitReached(#60752) (#61199)

Author: itn3000

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/AggregationManager.cs

@@ -302,7 +302,8 @@ private void RemoveInstrumentState(Instrument instrument, InstrumentState state)
                 {
                     lock (this)
                     {
-                        return (!CheckTimeSeriesAllowed() || !CheckHistogramAllowed()) ?
+                        // checking currentHistograms first because avoiding unexpected increment of TimeSeries count.
+                        return (!CheckHistogramAllowed() || !CheckTimeSeriesAllowed()) ?
                             null :
                             new ExponentialHistogramAggregator(s_defaultHistogramConfig);
                     }