[TM-317] Remove `UnpackEnv`
Description
Problem: in babylon UNPACK
has been made entirely pure, this
carrying environment is not required anymore.
Solution: remove it.
Related issue(s)
https://issues.serokell.io/issue/TM-317
✅ Checklist for your Merge Request
Related changes (conditional)
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Tests (see short guidelines)
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If I added new functionality, I added tests covering it. -
If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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Documentation
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My code complies with the style guide.
Edited by Konstantin Ivanov