Move BEFORE_INITIAL_EXECUTION and AFTER_INITIAL_EXECUTION from subscribers to ECA events

Issue information

From user: jurgenhaas

Contribution record

Fork management

Problem/Motivation

In #3277468: Performance optimization: dynamic event subscription, #3381551: Performance optimization: Unify the event and process initialization layer and #3382070: Enable event plugins to determine appliance we've already moved token providers and other pre- and post-event functionality into the ECA event classes. But not all, yet.

Proposed resolution

Move the remaining ones, if possible.

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