Relay 13: some explicit types are no longer required

[mrtnzlml]

For example, before Relay 13, it was required to annotate useLazyLoadQuery like so:

const data = useLazyLoadQuery<NavigationHeaderBadgeQuery>(graphql` … `);

However, this is no longer required when used together with relay_integration=true Flow option, see: facebook/relay@3c45f95

This issue proposes to remove or change relay/generated-flow-types rule to support this new way of using Relay 13.