Updates for all angular.io links to the new angular.dev domain. Additionally, adjustment to new resources where the equivalent does not exist on the new site (e.g. Tour of Heroes tutorial)
Newly generated projects will now use ECMAScript standard class field behavior by default.
If the legacy TypeScript behavior is required for a new project the `useDefineForClassFields`
TypeScript option can be set to `false` within the application's `tsconfig`. This should
be uncommon, and if needed, it is recommended to adjust code to match standard behavior where
possible.
The builder testing infrastructure and harness has been moved out of the
`@angular-devkit/build-angular` package and into a separate bazel only
module. This allows the testing code to be shared with other packages
within the repository. It also removes test only code from within
the package that is not specific any of the included builders.
