test(ngcc): build zone.js from source in scripts/build-packages-dist.sh (#33733)

In #33046, internal uses of `zone.js` were switched to reference it
directly from source (built with Bazel) instead of npm. As a result, the
necessary scripts were updated to build `zone.js` as necessary. However,
some `integration/**/debug-test.sh` scripts were missed (apparently
because they are not used on CI, but only locally as helpers for
debugging the integration projects).

This commit updates the `scripts/build-packages-dist.sh` script to also
build `zone.js`, so that other scripts (such as the various
`debug-test.sh` scripts) can use it.

PR Close #33733

integration/typings_test_ts36/package.json

@@ -22,7 +22,7 @@
     "@types/jasmine": "2.5.41",
     "rxjs": "file:../../node_modules/rxjs",
     "typescript": "3.6.4",
-    "zone.js": "file:../../dist/bin/packages/zone.js/npm_package"
+    "zone.js": "file:../../dist/zone.js-dist/zone.js"
   },
   "scripts": {
     "test": "tsc"