Adjust KPI threshold and rate as per latest KPI agreement

Adjust KPI threshold and rate as per latest KPI agreement

- CM Handle ID searches now can take 2.6 sec
- CM Handle searches now can take 24 sec
- Updated 'blue' lines to reflect KPI
- Updated 'green' lines to reflect current average (i.e. we expect measurements to be 'around' this)
- Experimental: increased cm notification forwarding by using more VUs
- Add timer metric to be able to check cm notification forwarding rate
- Temporary: removed redirecting of warning and errors to null device

Issue-ID: CPS-2793
Change-Id: I560985d4f9ce7a4c8aa27b3ae089a43a8a76b28a
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>