TST(string dtype): Remove xfail for combine_first (#60634) #41765

Job	Run time
Test Conda Forge Recipe - Python 3.10	2m 3s
Test Conda Forge Recipe - Python 3.11	1m 57s
Install Extras - all	5m 15s
Install Extras - clipboard	4m 30s
Install Extras - aws	4m 33s
Install Extras - compression	4m 24s
Install Extras - computation	4m 30s
Install Extras - excel	4m 28s
Install Extras - feather	4m 27s
Install Extras - fss	4m 28s
Install Extras - hdf5	4m 22s
Install Extras - gcp	4m 30s
Install Extras - html	4m 31s
Install Extras - mysql	4m 26s
Install Extras - output-formatting	4m 24s
Install Extras - parquet	4m 31s
Install Extras - performance	4m 26s
Install Extras - plot	4m 31s
Install Extras - postgresql	4m 37s
Install Extras - pyarrow	4m 30s
Install Extras - spss	4m 31s
Install Extras - sql-other	4m 27s
Install Extras - test	4m 28s
Install Extras - xml	4m 23s
	1h 43m 12s

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