[utils] `JsonRpcRequestStruct` incompatible with superstruct `pick` and `omit`

Following https://github.com/MetaMask/utils/commit/0d68084b8d8f64a59606b6559b901be4db7c0560 the `JsonRpcRequestStruct` is now incompatible with superstruct functions such as `pick` and `omit`. Trying to use them will result in a type error, see https://github.com/MetaMask/snaps/actions/runs/6823234052/job/18556824093 for an example.

Start by reviewing commit 0d68084b8d8f64a59606b6559b901be4db7c0560 and the failing MetaMask Snaps workflow linked in the issue. Trace how JsonRpcRequestStruct is typed and reproduce the error with superstruct pick and omit; done means both functions accept the struct without a TypeScript type error.

Written by the indexing model from the issue text.