fix(storage): key InstanceCache by app name and bucket (#16039)

[llamington]

Fixes #16039

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[paulb777]

/gemini review

[gemini-code-assist]

Code Review

This pull request updates the InstanceCache in FirebaseStorage to use a composite key consisting of both the Firebase app name and the storage bucket. This change ensures that different apps sharing the same bucket maintain distinct Storage instances, preventing authentication context collisions. I have no further feedback to provide.

[ncooke3]

Thanks, @llamington!