test: move controller construction to withController only

[mikesposito]

Explanation

This is a refactoring proposal over changes made in #7668. This PR focuses on the new controller tests: the idea is to move the controller construction and mocking logic to the withController function only, avoiding duplication of code and potential inconsistencies.

References

• Related to Feat/add config registry controller #7668

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them