remove is_lexsorted (#38975)
remove is_lexsorted (#38975)

Co-authored-by: Keppler, Kyle <3f119873ea97a1be48552da10de76f699895b531@gtri.gatech.edu>
dsm054/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,dsm054/pandas,rs2/pandas,datapythonista/pandas,rs2/pandas,dsm054/pandas,gfyoung/pandas,dsm054/pandas,pandas-dev/pandas,rs2/pandas,gfyoung/pandas,gfyoung/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,gfyoung/pandas,datapythonista/pandas,jorisvandenbossche/pandas,gfyoung/pandas,dsm054/pandas,rs2/pandas,pandas-dev/pandas,pandas-dev/pandas,datapythonista/pandas,datapythonista/pandas