"Internal return flags should remain internal" panic can be hit with inspector

[DaniPopes]

This panic

revm/crates/revm/src/handler/mainnet/post_execution.rs

Lines 107 to 111 in 13ce013

	SuccessOrHalt::FatalExternalError
	| SuccessOrHalt::InternalContinue
	| SuccessOrHalt::InternalCallOrCreate => {
	panic!("Internal return flags should remain internal {instruction_result:?}")
	}

can be hit with an inspector that returns Some({Call,Create}Output { result: InstructionResult::{Continue,CallOrCreate}, .. }) in call or create.

Encountered while migrating Foundry in https://github.com/foundry-rs/foundry/pull/7125/files#diff-29a0def5856966de3e16a20140415c388f71da82a37e2cfa0308c0f76085ab9fL659-R660

I'm guessing this is fine as a panic because it can only be hit with an invalid implementation or inspector.

Perhaps a better panic message can be emitted?

[rakita]

Agreed with said, we should include return flag inside panic.