fix: schema prop type fix

[kikkupico]

Fixes #2028

Summary

The schema prop of the GraphiQL component currently has the type GraphQLSchema | undefined. The correct type is GraphQLSchema | null | undefined because null is an accepted value. This PR fixes the type in the props, state and other functions that use the prop/state.

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Latest commit: 9b89b80

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[linux-foundation-easycla]

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