[WIP] treat calls to abstract methods in static same as runtime

[neilparikh]

Motivation

Test plan

See included automated tests.

[neilparikh]

We have a policy of testing changes to Sorbet against Stripe's codebase before
merging them. I've kicked off a test run for the current PR. When the build
finishes, I'll share with you whether or how it failed. Thanks!

Stripe employees can see the build results here:

→ https://go/builds/bui_PyonPSf2YqKNS1
→ https://go/builds/bui_PyonCCYkpQfq8Q
→ https://go/builds/bui_PyonClZBQrUBm8

[paracycle]

Suggested change

	auto possiblities = symbol.data(gs)->findParentMethodTransitiveAll(gs, targetName);
	for (auto overload : possiblities) {
	if (!overload.data(gs)->flags.isAbstract) {
	mayBeOverloaded = overload;
	break;
	}
	}
	}
	auto possibilities = symbol.data(gs)->findParentMethodTransitiveAll(gs, targetName);
	for (auto overload : possibilities) {
	if (!overload.data(gs)->flags.isAbstract) {
	mayBeOverloaded = overload;
	break;
	}
	}
	}