Make UserWarnings in plots display as normal text

[mbelak-dtml]

In some places, a UserWarning is display to inform the user of some events, e.g. that some plot will not be displayed because there would be too many items do display.
The places are:

• edvart/edvart/report_sections/univariate_analysis.py

  Line 187 in 7ec7bbb

  warnings.warn(

• edvart/edvart/report_sections/group_analysis.py

  Line 355 in 7ec7bbb

  warnings.warn(f"Too many categories ({num_cat}), not plotting distribution")

There are additional warnings, which should be considered whether they should remain as warnings, or also be changed to normal text:

• edvart/edvart/report_sections/timeseries_analysis/time_analysis_plot.py

  Line 122 in bded09d

  warnings.warn("Coloring by categorical column with many unique values!")

• edvart/edvart/report_sections/timeseries_analysis/rolling_statistics.py

  Line 96 in bded09d

  warnings.warn(f"Reducing window size to {window_size} due to insufficient samples.")

• edvart/edvart/report_sections/timeseries_analysis/seasonal_decomposition.py

  Line 97 in bded09d

  warnings.warn(