[metrics] Decide global logging for a request on the metric handler side

[rahulbabu95]

In middleware.go where we log globally for each HTTP request, we have a hardcoded logic to determine if the request came in for metrics handler using the uri to determine that global logging is required. A similar use case in ISO is handled by setting the 'X-Global-Logging' field in the response Header. This arguably isolates individual handlers to opt in/out of global logging and keeps component specific logic away from middleware.

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