Breakpoints: Replace references to faciaLeftCol with leftCol

Part 3 in a long running series… since the `faciaLeftCol` breakpoint is now the same as `leftCol` (thanks to https://github.com/guardian/frontend/pull/5923), remove all references to `faciaLeftCol`. Much of this is straightforward, but greatest number of changes effect the v1 commercial components, so you might want to sanity check my changes @austinh7.