Fix Aqua tests and Project files

[lkdvos]

This resolves the complaints of Aqua about stale dependencies:

• remove the test/Project.toml since these dependencies are defined in the main Project.toml
• remove Aqua from the [deps], since it is only a test dependency and should thus only be in [extras]

[ogauthe]

Thanks @lkdvos !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (e84b799) to head (3763964).
Report is 2 commits behind head on main.

Additional details and impacted files

@@    Coverage Diff    @@
##   main   #3   +/-   ##
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