chore: copy d.ts files during build

[SimenB]

Summary

Fixes #8085

Test plan

I've verified the files are in the build dir after running scripts/buildTs.js

I've verified that VS Code is able to follow the link in the built file and that the files are included by yarn pack

[SimenB]

Wait, this won't work as tsc changes the path to be /// <reference path="../src/istanbul-lib-coverage.d.ts" />

I think we need to have those .d.ts files in the root of the modules.

[SimenB]

It'll be good to ditch them entirely

[danilobuerger]

@SimenB Thanks! Would it be possible to get a release with this soon so TS users can use jest 24.3 without running into compilation errors?

[SimenB]

Yeah, there'll probably be a release on monday

[github-actions]

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