McAfee Web Proxy with COUNTER rrd_type on sensors

[PipoCanaja]

First YAML file using rrd_type: COUNTER
Also fixed the sensor_index cause the one used before was not stable in time (resulting in mix between graphs) (that depended on #14522)

Before (on prod):

After (on test with this PR):

DO NOT DELETE THE UNDERLYING TEXT

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[github-actions]

Please add test data so we can ensure your change is not broken in the future.
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[murrant]

LGTM

[PipoCanaja]

LGTM

@murrant Should I merge this one which currently includes #14522 or should we merge 14522 first and then merge this one after ?

[PipoCanaja]

LGTM

All good now.