Make Groovy Performance Test Stable

Make Groovy Performance Test Stable

- Disable memory assertion
- Allow default 50% margin on expected time
- Allow 300% margin on very fast test < 1ms
- Extend resource meter method with optional exceptional margin for an unstable test
- Update all time limits on plotted test to be average (rather then limit)

Issue-ID: CPS-2743
Change-Id: Icdcbe01b048c2d04166684cda4bf341a204c9a1d
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>