chore: remove expect from dev dependencies of pretty-format.

[mrazauskas]

From #13283 (comment)

Summary

Here is a quick idea how expect could be removed from the dev dependencies of pretty-format.

expect is needed only for one test, which is testing DummyMatcher class which is defined in the test file. This class is extending AsymmetricMatcher abstract class which is imported from expect.

The imported AsymmetricMatcher abstract class looks like this:

https://github.com/facebook/jest/blob/561907ce5d1e9065311cf585f75b9c5864036193/packages/expect/src/asymmetricMatchers.ts#L67-L89

All what the test needs is toAsymmetricMatcher method, but as one can see above it is not implemented in the parent class. This means that only the constructor and $$typeof property of AsymmetricMatcher are useful. I think we can safely copy these to DummyMatcher class and remove expect as a dependency. Or?

Test plan

Green CI.

[SimenB]

nice! 👍

[github-actions]

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