Include metric name in max series per metric limit exceeded error

[eeldaly]

Is your feature request related to a problem? Please describe.
When receiving an errMaxSeriesPerMetricLimitExceeded error, the metric name is not displayed.

Describe the solution you'd like
Include the metric name in the error message.

Additional context
When a user hits the max-series per metric name limit, they should know which metric caused the limit to be reached so that they can reduce their active series for that limit or increase the limit.

[yeya24]

Thanks! Proposal makes sense to me.

cortex/pkg/ingester/limiter.go

Line 132 in cdf9471

func (l *Limiter) FormatError(userID string, err error) error {

We have both formatMaxSeriesPerMetricError and formatMaxMetadataPerMetricError. We should include metric name to both error messages