Implement a full and to end suite

In many cases the implementation of changes like in CD environments is done by feature flags. The goal of this task is, when activated, the tests are executed in three phases:
1. Producer mode
2. Activate feature flag
3. Consumer mode

### Actual Behaviour
Currently we only execute on phase at a time

## Thoughts
Should this be for all scenarios or just specific scenarios?

Start by tracing the existing TestNG plugin execution to understand how it currently runs one phase at a time. Define whether the three-phase sequence applies to all scenarios or only selected ones, then verify that enabling the feature flag runs producer, activation, and consumer phases in order.

Written by the indexing model from the issue text.