Fix type annotation of assert functions

[bernt-matthias]

asserts: n, delta, min, max need to be str since the allow extensions: (K|M|G|T|P|E)i

solved by automatically converting bools, integers, and suffixed integers before calling the assertion functions.

follow up on https://github.com/galaxyproject/galaxy/pull/12528

I guess this should wait for the refactoring of the tests that is currently ongoing in https://github.com/galaxyproject/galaxy/pull/13186

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