Review codebase and use ChopPrecisionMut helper where applicable

[p0mvn]

          Seems like there are couple of other places in code base where we can use this new method, do we have future plans to change to this method?

Originally posted by @mattverse in #6261 (comment)

Background

Before introducing ChopPrecision(Mut) functions, we had to use various hacks of get rid of precision of a BigDec (for example, to scale it to Dec's precision, which can be seen in referenced above comment). With introduction of mentioned helpers, there is no more need to use hacks

Checked

Inspected filepaths are:

• filepath -> link to PR _(example)

Acceptance criteria

For a PR to be accepted it does NOT need to introduce changes to absolutely every place in codebase where a hack is used. A PR is eligible if it introduces at least some hacks refactored (though in this case, files that were checked by PR's author should be included in this issue: either by leaving a comment or editing a Checked section of this issue)

[p0mvn]

@pysel please edit issue to share context and acceptance criteria