handle objects with no constructor in hasOwnProperty

[ryanoglesby08]

I'm not super excited about the fix, so any feedback is welcome! It got hairy really quick, and looking at the docs for Object.create, I can see how this is a weird edge case that some have run into (including myself)

Summary

This problem is discussed in #6730 .

In short, objects created using unconventional means such as Object.create(null) will not have a constructor property, causing an exception to be throw in "packages/expect/src/utils.js" hasOwnProperty function.

This odd behavior of JS objects is discussed in depth in the MDN docs here.

Test plan

Added a test case to the unit tests for toMatchObject matcher. The included test case will throw an error TypeError: Cannot read property 'prototype' of undefined without the included fix.

Closes #6730

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[thymikee]

LGTM 👍

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