osmomath: disable thelper for some testing functions

[pysel]

Background

A few functions in osmomath/decimal.go are test helper functions, but they are not marked as helper functions

Suggested Design

mark these functions as helpers

Acceptance Criteria

helper functions marked

[ValarDragon]

Why do we want this? Seems like it just avoids the fn being printed in the stacktrace, not sure why thats a feature for us? https://pkg.go.dev/testing#T.Helper

I'd prefer to not have to think about this personally.

[pysel]

hmm, on the second look, I now see that adding t.Helper there does not do anything useful, because those functions internally do not fail the test (aka: call t.FailNow, t.Fatal etc), so adding a t.Helper mark is a no-op. I just wanted to remove the linting warnings, but now that I revisited this, I decided to simply disable them for those specific functions

thank you!

[ValarDragon]

Cool thanks!