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/ng.bzl b/tools/build_rules/js/ng.bzl
index 0a0f1e1..d4fe78c 100644
--- a/tools/build_rules/js/ng.bzl
+++ b/tools/build_rules/js/ng.bzl
@@ -20,6 +20,6 @@
 
     esbuild(
         name = name,
-        config = "//tools/build_rules/js:ngc.esbuild.js",
+        config = "//tools/build_rules/js:ngc.esbuild.mjs",
         **kwargs
     )