Key TakeawaysGeneral Motors said Wednesday that it would sell adapters that would help owners of its electric vehicles access Tesla's charging network.Tesla agreed to let a number of other automakers use its charging network last year, but production delays and layoffs at the EV maker have delayed the plans.Separately Wednesday, GM reached an agreement with a labor union partner in Canada that, if ratified, could avert a strike. General Motors (GM) buyers will soon be able to access Tesla's (TSLA) network ...