Removes the use of the private Protractor builder (`@angular-devkit/build-angular:private-protractor`)
from all integration test projects. Projects that still require E2E tests
now invoke Protractor directly via NPM scripts using `concurrently` to
manage the development server.
This commit introduces integration tests for hydration and event reply functionalities. Additionally, it implements a payload size check for the `event-dispatch-contract.min.js`.
PR Close#55708
