perf: avoid compiling unused bytecode

[henryiii]

Compiling bytecode is supposed to make usage more consistent for interaction. But it compiles everything, which isn't required for a single use non-interactive temporary environment. We can potentially save a bit of time this way.

This will need to be skipped for the uv backend in #751, since uv defaults to not compiling bytecode, and instead requires a flag to do so (most recent version). But flags aren't identical anyway.

[henryiii]

I’ll leave merging this up to @layday so it doesn’t interfere with #751.