[TM-342] Update template scripts to use babylonnet

Description

Problem: we have some templates in scripts/templates and they are using hardcoded alphanet.sh constant and refer to alphanet in variable names and comments. But alphanet is about to be decommissioned and babylonnet will be the primary network for testing instead.

Solution: simply replace all occurrences of alphanet with babylonnet. Ideally this thing should be configurable, but there is ongoing work to move this logic to Haskell, so these scripts are temporary and it should be fine to use a simple solution.

Related issue(s)

https://issues.serokell.io/issue/TM-342

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