test/devux: helper function for assertions conditional on error

[p0mvn]

Background

We tend to use a common pattern for asserting on the results in table-driven tests:

err := systemUnderTest(...)

if tc.expectedErr {
    require.Error(t, err)
    return
}

require.NoError(t, err)

We should make a helper for this pattern. e.g. osmoutils.ConditionalPanics(suite, expPanic, func)

Originally posted by @ValarDragon in #1872 (comment)

Acceptance Criteria

• helper is created
• skim our tests and replace / refactor to use the helper where applicable

[stackman27]

Hi @p0mvn I can work on this!

[p0mvn]

Awesome, thank you