refactor: stableswap inverse tests to be consistent with the stableswap pool

[p0mvn]

Description TBD

As per discussion, we should change the test structs to be more aligned with the stableswap pools. Stableswap pools do not have weights but they do have scaling factors.

Therefore, we should remove weights from the tests and instead add scaling factors into the set up

Additionally, we might want to consider using stableswap denoms in tests to be aligned with the abstraction: #1456 (comment)

Acceptance Criteria

• Test_StableSwap_CalculateAmountOutAndIn_InverseRelationship testcase struct does not have weights
• scaling factors are added and configured correctly instead
• denoms are changed to stableswap denoms ("uosmo" -> "ust")
• tests continue to pass

[stackman27]

I can work on this!

[p0mvn]

Hi @stackman27 . Thank you.

Please note that this is blocked by #1456. It doesn't prevent you from starting the work on another branch, just something to keep in mind

[stackman27]

Yup, i'll pull the work from #1456 and work on top of it

[stackman27]

Hi @p0mvn do you think i need #1459 to complete this PR because I believe i need []stableswap.PoolAsset{...} in stableswap_pool.pb.go to test out scaling factors.

Also is there anywhere i can read up on scaling factors? I am a lil confused with how they impact the the stableswap pools.