fix: added inherited string keys check on `subsetEquality` method

[lpizzinidev]

Summary

As a result of #13810, this fixes the subsetEquality method to consider also an object's inherited string keys.

[SimenB]

A test case would be nice so we avoid a regression in the future

[lpizzinidev]

@SimenB What do you think a good regression test could be in this case?

[SimenB]

@joshkel thoughts?

[lpizzinidev]

Hi @joshkel ✋ Following your recent fix (#13810), I pushed this PR that will use the getObjectKeys function in subsetEquality. I need to add a regression test as well. Can you give me an example where getObjectKeys produces a different output than Reflect.ownKeys?

[github-actions[bot]]

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