fix: hack a fix for adjustmentinterval not converting inside rules based samples

[TylerHelmuth]

Which problem is this PR solving?

• closes Convert does not correctly handle converting EMADynamicSamplerConfig.AdjustmentInterval #766

Short description of the changes

• hacks away at an issue where the convert tool couldnt handle the []Rules in the rules based sampler.

[cartermp]

I was going to ask about a representative test case, but it appears that testing for this isn't really representative. Given that this is a delightfully hacky fix, I think we should have a test that exemplifies the weird config people could do in the 1.x world that results in this bug.

[TylerHelmuth]

@cartermp added another test case that handles the slice issue, but not the config.Duration change. I'd like to take a look at this issue with fresh eyes anyways, this PR is more to show what the issue is.