Remove `_verbose` and clean `makeModuleSetUpAndTestCaseClass`.

The `_verbose` attribute of `SlapOSInstanceTestCase` was unused and it
is now removed.
As the `makeModuleSetUpAndTestCaseClass` needed to be edited to remove
`_verbose` from the class type instantiation, that function has been
formatted, documented and typed.

See merge request !664
33 jobs for master in 0 seconds
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