ci: Add swift wasm builds to CI to prevent future breakages to wasm builds

[scottmarchant]

⚠️ This PR is blocked from final testing and merging until dependent PR's are merged.

Change summary

Added swift wasm as a CI target, to help prevent future breakages to swift wasm builds in DataLoader

Details

• Adds wasm build to pull_request and main, by adding references to new wasm build workflow from swift-nio.

Notes

• The new wasm workflow in swift-nio isn't merged yet.
• This PR is part of a larger effort by PassiveLogic to add wasm support to many popular repositories.

PR Dependencies

The following PR's must be merged before this PR can be merged:

• feat: Add Swift WebAssembly compilation support to swift-distributed-tracing #174
• CI: Add build check for WebAssembly SDK swift-nio#3159

Testing done

Verified new github workflow starts correctly. But cannot verify full functionality until the dependent PR's are merged.

See https://github.com/PassiveLogic/swift-distributed-tracing/actions/runs/15858257532/job/44708826507?pr=1

Remaining work

• Update this PR after swift-nio wasm workflow is merged to main.
• Run tests on this once all dependent PR's are merged.

[ktoso]

Sorry I missed this back then, is this something you'd like to push forward @MaxDesiatov @scottmarchant ? Got a few moments on my hands so could help verify the CI runs