[BUG] [ColorControl] Step commands with StepMode = 0 should return an error

[jmartinez-silabs]

Reproduction steps

Part of the following PR #25345 fixed a few error codes returned and also the timing at which they were returned (as early as possible)

It was pointed out that a StepMode Stop is implemented with similar behaviour to MoveMode Stop and that there is, however, no StepMode Stop in the spec.
#25345 (comment)

StepMode=0 is a reserved value with no current definition. Any step command with a StepMode of 0 should return INVALID_COMMAND

To reproduce the issue send
./chip-tool colorcontrol step-hue 0 200 200 1 1 <node_id> <endpoint>
the command will return a success. It should return a failure

Bug prevalence

Always

GitHub hash of the SDK that was being used

a2f83a9

Platform

core

Platform Version(s)

No response

Anything else?

No response