build(docs-infra): use local version of Zone.js when testing against local packages (#35858)

In some cases, we want to test the AIO app or docs examples against the
locally built Angular packages (for example to ensure that the changes
in a commit do not introduce a breaking change). In order to achieve
this, we have the `ng-packages-installer` script that handles updating
a project's `package.json` file to use the locally built Angular
packages (and appropriate versions for their (dev-/peer-)dependencies).

Previously, `ng-packages-installer` would only consider the locally
built Angular packages (from `dist/packages-dist/`). However, given that
Zone.js is now part of the `angular/angular` repo, it makes sense to
also use the locally built Zone.js package (from `dist/zone.js-dist/`).
Otherwise, the tests might fail for commits that update both the Angular
packages (and related docs examples) and the Zone.js package. An example
of such a simultaneous change (that would have broken tests) is #33838.

This commit updates the script to install the locally built Zone.js
package (in addition to the Angular ones). The commit ensures that the
Zone.js package will always be available alongside the Angular packages
(i.e. that the Zone.js package will be built by the same script that
builds the Angular packages and that the `dist/zone.js-dist/` directory
will be cached on CI).

Note: This problem was discovered while enabling docs examples unit
tests in #34374.

PR Close #35858

.circleci/config.yml

@@ -465,12 +465,14 @@ jobs:
       - when:
           condition: << parameters.ivy >>
           steps:
-              # Rename the Ivy packages dist folder to "dist/packages-dist" as the AIO
-              # package installer picks up the locally built packages from that location.
+              # Rename the "dist/*-dist-ivy-aot" packages directories (persisted to the workspace by
+              # the `build-ivy-npm-packages` job) to "dist/*-dist" as the AIO package installer
+              # picks up the locally built packages from that location.
               # *Note*: We could also adjust the packages installer, but given we won't have
               # two different folders of Angular distributions in the future, we should keep
               # the packages installer unchanged.
             - run: mv dist/packages-dist-ivy-aot dist/packages-dist
+            - run: mv dist/zone.js-dist-ivy-aot dist/zone.js-dist
         # Run examples tests. The "CIRCLE_NODE_INDEX" will be set if "parallelism" is enabled.
         # Since the parallelism is set to "5", there will be five parallel CircleCI containers.
         # with either "0", "1", etc as node index. This can be passed to the "--shard" argument.
@@ -552,6 +554,7 @@ jobs:
           root: *workspace_location
           paths:
             - ng/dist/packages-dist-ivy-aot
+            - ng/dist/zone.js-dist-ivy-aot
 
   # We run a subset of the integration tests outside of Bazel that track
   # payload size.