Use variables for theme-color-level function
Use variables for theme-color-level function

Closes #25313

Hemphill/bootstrap-docs,gijsbotje/bootstrap,kvlsrg/bootstrap,stanwmusic/bootstrap,creativewebjp/bootstrap,coliff/bootstrap,vsn4ik/bootstrap,GerHobbelt/bootstrap,coliff/bootstrap,kvlsrg/bootstrap,joblocal/bootstrap,seanwu99/bootstrap,Lyricalz/bootstrap,GerHobbelt/bootstrap,joblocal/bootstrap,tagliala/bootstrap,kvlsrg/bootstrap,bootstrapbrasil/bootstrap,creativewebjp/bootstrap,peterblazejewicz/bootstrap,joblocal/bootstrap,fschumann1211/bootstrap,bardiharborow/bootstrap,peterblazejewicz/bootstrap,inway/bootstrap,yuyokk/bootstrap,Hemphill/bootstrap-docs,bardiharborow/bootstrap,Lyricalz/bootstrap,vsn4ik/bootstrap,gijsbotje/bootstrap,GerHobbelt/bootstrap,bootstrapbrasil/bootstrap,Lyricalz/bootstrap,vsn4ik/bootstrap,fschumann1211/bootstrap,Lyricalz/bootstrap,tagliala/bootstrap,twbs/bootstrap,gijsbotje/bootstrap,m5o/bootstrap,nice-fungal/bootstrap,Hemphill/bootstrap-docs,bardiharborow/bootstrap,m5o/bootstrap,yuyokk/bootstrap,twbs/bootstrap,bootstrapbrasil/bootstrap,stanwmusic/bootstrap,tjkohli/bootstrap,Hemphill/bootstrap-docs,peterblazejewicz/bootstrap,creativewebjp/bootstrap,seanwu99/bootstrap,bardiharborow/bootstrap,tjkohli/bootstrap,seanwu99/bootstrap,vsn4ik/bootstrap,stanwmusic/bootstrap,joblocal/bootstrap,inway/bootstrap,zalog/bootstrap,fschumann1211/bootstrap,yuyokk/bootstrap,seanwu99/bootstrap,zalog/bootstrap,zalog/bootstrap,nice-fungal/bootstrap,tagliala/bootstrap,fschumann1211/bootstrap,yuyokk/bootstrap,stanwmusic/bootstrap,inway/bootstrap,creativewebjp/bootstrap,gijsbotje/bootstrap,nice-fungal/bootstrap