[ATR-23947] Update EventViewCreatorAlgorithm.cxx to renounce any set m_cachedViewsKey
This ReadHandle is set as optional in execute, but it also needs to be optional from the perspective of the Scheduler too.
Revoking it from the scheduler to achieve this.
Correct algorithm ordering here is guaranteed via Step numbering.
(Quick web UI MR, not expecting any count changes)