chore(angular-server): add sync github action and update @stencil/core to 4.19.1 in core (#29670)

Issue number: internal

---------

This does a couple things:

**1 - Adds a `sync` command to get the latest `core` build in
`angular-server`**

The release process for `angular-server` failed
[here](https://github.com/ionic-team/ionic-framework/actions/runs/9686982182/job/26730689874).
This failure was only made apparent because the Lerna command
[here](https://github.com/ionic-team/ionic-framework/blob/52ff0505e86dc204cb2fd2fdaf67229e6eeb36f8/.github/workflows/actions/publish-npm/action.yml#L35)
runs prior to building each package.

This should have been caught by CI on the [update to @stencil/core to
v4.19.0](https://github.com/ionic-team/ionic-framework/pull/29666), but
the `angular-server` package is the only package that doesn't sync
`core` before it builds. This PR adds a `sync` command so that
`angular-server` will use the latest core build during the normal build
action.

**2 - Resolving types errors in `angular-server`**

After properly syncing `core` in `angular-server` using the command
added, running build fails with the following:

<img width="400px" alt="Screenshot 2024-06-27 at 1 16 15 PM"
src="https://github.com/ionic-team/ionic-framework/assets/6577830/68d74750-821b-4776-b563-124d8fa06a79">

This was a regression in Stencil. `@stencil/core` has been updated to
resolve these errors so the build passes.