REF: simplify _append_internal (#62351) #48075

Job	Run time
Test Conda Forge Recipe	2m 11s
Install Extras - test	4m 4s
Install Extras - output-formatting	4m 3s
Install Extras - parquet	4m 4s
Install Extras - pyarrow	4m 4s
Install Extras - compression	4m 3s
Install Extras - postgresql	4m 14s
Install Extras - computation	4m 25s
Install Extras - clipboard	3m 58s
Install Extras - hdf5	3m 56s
Install Extras - all	4m 49s
Install Extras - excel	4m 6s
Install Extras - gcp	4m 4s
Install Extras - feather	4m 2s
Install Extras - spss	4m 14s
Install Extras - performance	4m 9s
Install Extras - html	4m 8s
Install Extras - xml	4m 4s
Install Extras - mysql	4m 2s
Install Extras - aws	4m 10s
Install Extras - plot	4m 13s
Install Extras - fss	4m 1s
Install Extras - sql-other	4m 1s
	1h 33m 5s

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