[k6] Remove incorrect passthrough rates

[k6] Remove incorrect passthrough rates

Reported rates for passthrough operations is incorrectly reported,
due to it being averaged over whole test time including setup and
teardown. It was agreed to simply not report rates, and only report
NCMP overhead.

- remove http request rates for passthrough operations
- change VUs from passthrough read so that there are 10 total

Issue-ID: CPS-2264
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: Ida498955e69dffb332d6efeb8a8d73343565f9a1