chore: use createDirectory from jest-util when creating directories

[SimenB]

Summary

After landing #7408, jest-worker will use worker_threads if they are available (behind a flag in node 10 & 11, unflagged in Node 12). However, running Jest's own integration tests in a worker currently fails with TypeError: process.umask is not a function

If you do not provide a mode to mkdir, it uses process.umask (https://github.com/substack/node-mkdirp/blob/f2003bbcffa80f8c9744579fabab1212fc84545a/index.js#L64) which throws that error.

See https://nodejs.org/api/worker_threads.html#worker_threads_class_worker

process.chdir() and process methods that set group or user ids are not available.

createDirectory in jest-util passes 777 as mode (same as node's own fs.mkdir does), so it works perfectly fine in a worker

This is just changing internal stuff, so no changelog.

Test plan

Ran tests locally with workers after the change

[rickhanlonii]

LGTM! Should we add node 10 + experimentalWorker to circle?

[SimenB]

Yeah, we can do that.

[jeysal]

Mind also extracting createDirectory from jest-util's index.js to its own file while at it?
That being in there already bugged me when I added specialChars recently 😄

[SimenB]

Yeah, can do that as well

[SimenB]

Added the worker build, hopefully it passes 🤞

[thymikee]

Well played

[SimenB]

It's failing... @rickhanlonii something you could look into? Seems like the coverage doesn't pick up uncovered files, as well as some other stuff

[SimenB]

Moved the worker CI run to #7637

[github-actions]

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