Sandbox javascript build further

postgresql was failing to find configuration, add it to the sandbox.

When building JS, we were getting the following error:
  [!] RollupError: Node tried to load your configuration file as CommonJS
  even though it is likely an ES module. To resolve this, change the
  extension of your configuration to ".mjs", set "type": "module" in your
  package.json file or pass the "--bundleConfigAsCjs" flag.

Rename the configuration to be mjs to make it happy, and fix other leaks
found at the same time.

Change-Id: I59d8f9624b349ff5b27a6eeed8923f8d13d56744
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/tools/build_rules/js/BUILD b/tools/build_rules/js/BUILD
index 86a0288..4221b05 100644
--- a/tools/build_rules/js/BUILD
+++ b/tools/build_rules/js/BUILD
@@ -1,5 +1,6 @@
 load("@npm//:@angular/compiler-cli/package_json.bzl", angular_compiler_cli = "bin")
 load(":ts.bzl", "ts_project")
+load("@aspect_bazel_lib//lib:copy_file.bzl", "copy_file")
 
 exports_files([
     "cypress.config.js",
@@ -16,7 +17,6 @@
     name = "ngc.esbuild",
     srcs = ["ngc.esbuild.ts"],
     tsconfig = "//:tsconfig.node",
-    visibility = ["//visibility:public"],
     deps = [
         "//:node_modules/@angular/compiler-cli",
         "//:node_modules/@babel/core",
@@ -25,6 +25,13 @@
     ],
 )
 
+copy_file(
+    name = "ngc_esbuild_js_copy",
+    src = ":ngc.esbuild.js",
+    out = "ngc.esbuild.mjs",
+    visibility = ["//visibility:public"],
+)
+
 py_binary(
     name = "assemble_service_worker_files",
     srcs = [