[not-for-merge] apply server action transforms in snapshot tests

[unstubbable]

This allows us to quickly iterate on source map changes in the server action transforms (or any SWC transform we may add later).

The generated sourcemap files from the fixtures can be used to investigate (e.g. using https://evanw.github.io/source-map-visualization/) how setting spans in the transforms affect the source mapping.

I'm guessing that with the changes in turbopack/crates/turbopack-tests/Cargo.toml, specifically pulling in next-core, this may not be a mergeable approach. Looking for suggestions here.

[ijjk]

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Commit: addc24d

[unstubbable]

closing in favor of #75005