Fix DataFrame Merge issue

[asmirnov82]

Change Clone method to return correct ColumnType for all inheritors of PrimitiveDataFrameColumn class. Before the fix column of parent PrimitiveDataFrameColumn was returned instead

Fixes #6127

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@150e68f). Click here to learn what that means.
The diff coverage is 98.47%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6677   +/-   ##
=======================================
  Coverage        ?   68.80%           
=======================================
  Files           ?     1215           
  Lines           ?   251857           
  Branches        ?    26257           
=======================================
  Hits            ?   173280           
  Misses          ?    71765           
  Partials        ?     6812           

Flag	Coverage Δ
Debug	68.80% <98.47%> (?)
production	63.32% <98.00%> (?)
test	88.88% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...crosoft.Data.Analysis/DataFrameColumnCollection.cs	79.66% <71.42%> (ø)
.../Microsoft.Data.Analysis/BooleanDataFrameColumn.cs	100.00% <100.00%> (ø)
src/Microsoft.Data.Analysis/ByteDataFrameColumn.cs	100.00% <100.00%> (ø)
src/Microsoft.Data.Analysis/CharDataFrameColumn.cs	90.90% <100.00%> (ø)
...Microsoft.Data.Analysis/DateTimeDataFrameColumn.cs	81.81% <100.00%> (ø)
.../Microsoft.Data.Analysis/DecimalDataFrameColumn.cs	90.90% <100.00%> (ø)
...c/Microsoft.Data.Analysis/DoubleDataFrameColumn.cs	100.00% <100.00%> (ø)
...rc/Microsoft.Data.Analysis/Int16DataFrameColumn.cs	100.00% <100.00%> (ø)
...rc/Microsoft.Data.Analysis/Int32DataFrameColumn.cs	100.00% <100.00%> (ø)
...rc/Microsoft.Data.Analysis/Int64DataFrameColumn.cs	100.00% <100.00%> (ø)
... and 7 more

[michaelgsharp]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[michaelgsharp]

LGTM. Thanks for submitting this!

[JakeRadMSFT]

Merged into Generic Math branch. (This is just a note for myself)