ci: Enables opt-in wasm CI build for sql-kit

⚠️ This PR is blocked from final testing and merging until dependent PR's are both merged and released. I added issues to the diff that I will resolve once everything is ready to resolve. # Change summary Added swift wasm as a opt-in CI target, to help prevent future breakages to swift wasm builds. This PR is [part of a larger effort](https://github.com/PassiveLogic/swift-web-examples/issues/1) by PassiveLogic to add wasm support to many popular repositories. # Notes - CI for this won't pass until a future swift-nio version is ready. See details below. # PR Dependencies The following PR's must be merged before this PR can be merged: - https://github.com/apple/swift-nio/pull/3271 (already merged, waiting for new swift-nio release) - https://github.com/vapor/ci/pull/54 - https://github.com/vapor/sql-kit/pull/190 # Testing done Verified this new workflow functions correctly using a temporary PR that enables the new wasm build. See https://github.com/PassiveLogic/sql-kit/actions/runs/15886122859/job/44798410586?pr=1 # Remaining work - [ ] Run tests on this once all dependent PR's are merged and released.