TST: Add extra regression tests for gh-11096
TST: Add extra regression tests for gh-11096

Conversion from timedelta was only reliably broken for integer numbers of weeks (including 0)
seberg/numpy,mhvk/numpy,mattip/numpy,WarrenWeckesser/numpy,ahaldane/numpy,anntzer/numpy,pbrod/numpy,gfyoung/numpy,gfyoung/numpy,Eric89GXL/numpy,simongibbons/numpy,ahaldane/numpy,pizzathief/numpy,shoyer/numpy,jakirkham/numpy,jorisvandenbossche/numpy,madphysicist/numpy,mattip/numpy,pbrod/numpy,jorisvandenbossche/numpy,pdebuyl/numpy,grlee77/numpy,pizzathief/numpy,jakirkham/numpy,jorisvandenbossche/numpy,pbrod/numpy,pdebuyl/numpy,MSeifert04/numpy,endolith/numpy,WarrenWeckesser/numpy,pizzathief/numpy,ahaldane/numpy,abalkin/numpy,Eric89GXL/numpy,madphysicist/numpy,pbrod/numpy,anntzer/numpy,rgommers/numpy,mhvk/numpy,jakirkham/numpy,seberg/numpy,charris/numpy,pizzathief/numpy,endolith/numpy,shoyer/numpy,Eric89GXL/numpy,madphysicist/numpy,gfyoung/numpy,MSeifert04/numpy,mhvk/numpy,WarrenWeckesser/numpy,rgommers/numpy,jakirkham/numpy,endolith/numpy,mhvk/numpy,ahaldane/numpy,numpy/numpy,shoyer/numpy,abalkin/numpy,Eric89GXL/numpy,mhvk/numpy,grlee77/numpy,grlee77/numpy,pizzathief/numpy,simongibbons/numpy,abalkin/numpy,numpy/numpy,WarrenWeckesser/numpy,jorisvandenbossche/numpy,numpy/numpy,charris/numpy,seberg/numpy,simongibbons/numpy,anntzer/numpy,jorisvandenbossche/numpy,mattip/numpy,MSeifert04/numpy,MSeifert04/numpy,pdebuyl/numpy,ahaldane/numpy,numpy/numpy,charris/numpy,simongibbons/numpy,WarrenWeckesser/numpy,anntzer/numpy,grlee77/numpy,rgommers/numpy,madphysicist/numpy,shoyer/numpy,shoyer/numpy,charris/numpy,grlee77/numpy,pdebuyl/numpy,seberg/numpy,simongibbons/numpy,mattip/numpy,jakirkham/numpy,MSeifert04/numpy,rgommers/numpy,pbrod/numpy,madphysicist/numpy,endolith/numpy