Fix waiting init message is not appended to wait list

[grishasobol]

Problem

There can be some cases when waiting init message is not going to be appended into wait list because of lock of gas.

gear/pallets/gear/src/internal.rs

Lines 338 to 348 in 9a37ccb

	} else {
	maximal_hold
	};
	// Validating duration.
	if hold.expected_duration().is_zero() {
	// TODO: Replace with unreachable call after:
	// - `HoldBound` safety usage stabilized;
	log::error!("Failed to figure out correct wait hold bound");
	return;
	}

This log::error can be called in case message have not enough gas to be added in the wait list. In most cases this is restricted by core-processor checks, but it does not protect cases when message will be added to waiting init list.
So, if some program or user will send error to uninitialised program with specific amount of gas, than message will be forgotten. So, it will be never consumed and gas node will stay forever in storage.

Steps

You can try this test in pallet-gear:

#[test]
fn calculate_gas_waiting_init() {
    let wat = r#"
        (module
            (import "env" "memory" (memory 1))
            (import "env" "gr_wait_up_to" (func $wait (param i32)))
            (import "env" "gr_program_id" (func $program_id (param i32)))
            (import "env" "gr_send" (func $send (param i32 i32 i32 i32 i32)))
            (export "init" (func $init))
            (func $init
                (call $program_id (i32.const 0))
                (call $send (i32.const 0) (i32.const 0) (i32.const 1) (i32.const 0) (i32.const 1000))
                (call $wait (i32.const 1))
            )
        )"#;

    init_logger();
    new_test_ext().execute_with(|| {
        let pid = Gear::upload_program(
            RuntimeOrigin::signed(USER_1),
            ProgramCodeKind::Custom(wat).to_bytes(),
            DEFAULT_SALT.to_vec(),
            EMPTY_PAYLOAD.to_vec(),
            210_105_500,
            0,
            false,
        )
        .map(|_| get_last_program_id())
        .expect("Program uploading failed");

        run_to_block(4, None);
    });
}

Gas limit amount 210_105_500 has been found, so that the case would happen.

Possible Solution

1. Remove waiting init list and reply with error for all messages, that are sent to uninitialised program.
2. In case we cannot put message to the wait list then reply with an error.

[grishasobol]

take also #3707 in account