[jest-preset] Fix mock for Linking

[jzaefferer]

Summary:

All three patched methods are supposed to return Promise<any>. Having the mock return undefined for them breaks tests that expect the Promise.

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[react-native-bot]

	Fails
🚫	📋 Missing Changelog - Please add a Changelog to your PR description. See Changelog format

	Warnings
⚠️	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.

Generated by 🚫 dangerJS against 932995b

[jzaefferer]

Fails
🚫
📋 Missing Changelog - Please add a Changelog to your PR description. See Changelog format

I don't know what to write for this. The template does not include a prefix for changing mocks.

Warnings
⚠️ 📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.
Generated by 🚫 dangerJS against 932995b

There are no tests for mocks, right?

[meta-cla]

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