Enable Detekt on every source set

[MGaetan89]

Pull request

Description

Now Detekt will analyse every Kotlin file in the project, not only production code (in src/main).
I've fixed the few reported issues following this change.

Changes made

• Self-explanatory

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[github-actions]

Code Coverage

Overall Project	31.07%	🟢

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