adding types to the mock utils in jest

[lee-leonardo]

adding the types file here, pretty sure this is the correct spot, not in actual core repo.

Summary

In response to #9534 the instructions were to add to ts definitions to jest-core.
I am pretty certain this is not actually in the jest-core file as a file already exists but rather in the mock

Test plan

Ran yarn jest to verify my changes were non-breaking.
As this is a types file, not 100% sure what tests to write, maybe output? Example would help.

[SimenB]

@lee-leonardo sorry I missed this! Is this still needed?

/cc @mrazauskas or is it covered by your recent changes?

[mrazauskas]

At first glanced, the types here look like a copy from @types/jest. These there already included and recently I reworked / improved some parts. This only means that quit some rebasing would be needed.

Seems like only to details are missing in current types from this PR: TSDoc comments in MockInstance and moving types to separate file (I was about to do this soon). Perhaps new PR would be better idea (and more easy to do) than rebasing this one?

[SimenB]

Perhaps new PR would be better idea (and more easy to do) than rebasing this one?

Yeah, I think so 👍

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