fix(hdrhistogram): handle case when intervals larger than time range

Handle case when interval is larger than the time range in histogram summary by interval.
If the specified interval is greater than the difference between end_time and start_time,
use the actual time range as the window step to avoid empty intervals.

(cherry picked from commit 0f38802)

Author: juliayakovlev

sdcm/utils/hdrhistogram.py

@@ -163,7 +163,7 @@ def build_histograms_summary_with_interval(self, path: str,
         try:
             start_ts = int(self.start_time)
             end_ts = int(self.end_time)
-            if end_ts - start_ts < TIME_INTERVAL:
+            if end_ts - start_ts < interval:
                 window_step = int(end_ts - start_ts)
             else:
                 window_step = interval or TIME_INTERVAL