[Serve] validate lookback period > metric interval

[abrarsheikh]

should we just add validation to ensure lookback period > metric interval. Not sure about the comparison between delay and metric interval here - why would the users interpret the two to be related? I interpret the delay to just be time to wait to apply the autoscaling decision

Originally posted by @akshay-anyscale in #57652 (comment)

[vaishdho1]

I will pick this up