Remove App Check from Storage

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

Storage shouldn't reference App Check directly, since this adds a dependency. This will be fixed in a follow up CL.

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Testing

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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Notes

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• Read the contribution guidelines CONTRIBUTING.md.
• Changes to the public API require an internal API review. If you'd like to help us make Firebase APIs better, please propose your change in a feature request so that we can discuss it together.