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/run_tests.sh

@@ -36,9 +36,6 @@ else
   TEST_DIRS=$(ls | grep -v node_modules)
 fi
 
-# We need to build zone.js npm package because it is not built in build-packages-dist.sh
-${bazel_bin} build //packages/zone.js:npm_package
-
 # Workaround https://github.com/yarnpkg/yarn/issues/2165
 # Yarn will cache file://dist URIs and not update Angular code
 readonly cache=.yarn_local_cache