Fix build:wasm:dev for --dev builds (#6038)

This is useful since it preserves Rust backtraces in WASM.

scripts/build-wasm-dev.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+set -euo pipefail
+
+rm -rf rust/kcl-wasm-lib/pkg
+mkdir -p rust/kcl-wasm-lib/pkg
+rm -rf rust/kcl-lib/bindings
+
+cd rust
+export RUSTFLAGS='--cfg getrandom_backend="wasm_js"'
+wasm-pack build kcl-wasm-lib --dev --target web --out-dir pkg
+export RUSTFLAGS=''
+cargo test -p kcl-lib export_bindings
+cd ..
+
+cp rust/kcl-wasm-lib/pkg/kcl_wasm_lib_bg.wasm public
+yarn fmt:generated