Refactor test-scripts

[Syndesi]

Currently most test scripts are defined directly in the composer.json file - a standard location for PHP developers to look at, therefore reducing the barrier to entry. However their content got more verbose over time, and has reached a point where a refactor is advisable.

As this GitHub organization had good experiences with Task, this will likely be used as the new foundation.

Aspects which need more refinement / definition:

• Will the Task tool be embedded into every Docker container image, i.e. develop and the CI/CD one?
• Can bin/ scripts be converted to task-jobs as well?

Acceptance requirements:

• Convert all scripts in the composer.json file to a task-job, including relevant dependencies etc.