Previously, we were using ngx-build-plus with a custom webpack config to determine the git SHA at runtime.
Now, after migrating to bazel and transfering to angular/angular, this commit uses ng-dev to stamp the latest git SHA directly in angular devtools' application environment.
This commit also removes the old webpack configs.
Some tooling was brought in from angular/components to help with bundling spec files for Karma. This tooling has since been ported over to the dev-infra repo. This commit dedupes the tooling and instead depends on the angular/dev-infra-private repo.
Previously we were running Cypress with bazel in an effort to save on CI time when devtools dependencies did not change. This commit reverts to running Cypress manually, until we can revisit building devtools with local Angular packages to save CI time.
