Add next-custom-transforms tests to verify source maps

[unstubbable]

This test suite allows us to quickly verify that the spans that are defined in the SWC transforms yield correct source maps. The output.js and output.js.map files can be used to visualize the source mapping, e.g. at https://evanw.github.io/source-map-visualization/.

For now I'm adding a single fixture for 'use cache' with this PR.

[unstubbable]

• Add next-custom-transforms tests to verify source maps #75005 👈 (View in Graphite)
• build: Update swc_core to v10.2.5 #75002
• canary

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[ijjk]

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