Tolerance for or to
Rewrite the sentence to make tolerate the main verb:
Under our new policy, [name of company] will not tolerate discrimination in the workplace, including but not limited to: [list of examples].
Italics highlight the recommended verb form; square brackets indicate variables to fill in.
Either of the two choices would work, with a preference for "for". Although you didn't ask about it, "of" would also work, and probably would be second, after "for", before "to".