Fix test for 6.x branch to either remove or include pool cleanup

[mattverse]

Currently the 6.x branch test is broken: it's mainly because we're not including gamm generalization v6.x(which we decided not to include in v6.x), but also because pool cleanup(#652) is currently not included in v6.x.

Our take should be:

• either remove pool_test.go where pool cleanup tests are included
• or include pool cleanup in v6.x

depending on whether we want pool cleanup in 6.x or not.

[ValarDragon]

Aren't the tests broken due to the function rename? Couldn't we just find/replace all of the new function signatures with the old ones?

[mattverse]

They are broken due to function rename but also,

they are also broken because 6.x includes pool clean up tests(https://github.com/osmosis-labs/osmosis/blob/v6.x/x/gamm/keeper/pool_test.go#L68), but not the actual logic and methods for pool cleanup

[ValarDragon]

Ah I see, your right we should revert the pool cleanup change from the v6.x branch entirely!

[mattverse]

Closing in favor of #799