* Add additional test cases for rx.call_script
Include internal vars inside an f-string to be properly rendered on the backend
and frontend.
* [ENG-3870] rx.call_script with f-string var produces incorrect code
Avoid casting javascript code with embedded Var as LiteralStringVar
There are two cases that need to be handled:
1. The javascript code contains Vars with VarData, these can only be evaluated
in the component context, since they may use hooks. Vars with VarData cannot be
used from the backend. In this case, we cast the given code as a raw js
expression and include the extracted VarData.
2. The javascript code has no VarData. In this case, we pass the code as the
raw js expression and cast to a python str to get a js literal string to eval.
* use VarData.__bool__ instead of `is None`
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