DOUBLE_FORWARD_SLASHES_IN_URL should be applicable to ARM only

There are legit cases in data-plane where a path parameter can be a '/'. Please make this check applicable only to ARM.

Start by locating the DOUBLE_FORWARD_SLASHES_IN_URL check and tracing how it distinguishes ARM from data-plane validation. Confirm the behavior for data-plane path parameters containing '/' and for ARM requests; done means the check applies only to ARM without rejecting legitimate data-plane paths.

Written by the indexing model from the issue text.