[PassManager] Make passes inherit from RequiredPassInfoMixin/OptionalPassInfoMixin (#192120)

It's very easy to forget to add `isRequired() { return true; }` for
passes that must be run on all IR, rather than e.g. being skipped on
optnone functions.

This PR adds RequiredPassInfoMixin/OptionalPassInfoMixin which have
`isRequired()`, and the long term vision is there to be no default
`isRequired()` on PassInfoMixin.

However, for out-of-tree migration purposes, we leave a `isRequired() {
return false; }` for now in PassInfoMixin.

https://discourse.llvm.org/t/rfc-introduce-mandatorypassinfomixin-optionalpassinfomixin-for-required-not-required-passes/90547

Assisted-by: Gemini
GitOrigin-RevId: 11729f768a053360cfaf61f903ed52a1fe930dea