feat(@schematics/angular): change layout of e2e files

[alan-agius4]

With this change E2E files will be relocated inside an existing application instead of creating a seperate E2E project. This will also remove a lot of extra boilerplating inside the workspace configuration file.

File layout:

│   browserslist
│   karma.conf.js
│   tsconfig.app.json
│   tsconfig.spec.json
│   tslint.json
│
├───e2e
│   │   protractor.conf.js
│   │   tsconfig.e2e.json
│   │
│   └───src
│           app.e2e-spec.ts
│           app.po.ts
│
└───src
    │   favicon.ico
    │   index.html
    │   main.po.ts
    │   main.ts
    │   polyfills.ts
    │   styles.css
    │   test.ts
    │
    ├───app
    │       app.component.css
    │       app.component.html
    │       app.component.spec.ts
    │       app.component.ts
    │       app.module.ts
    │
    ├───assets
    │       .gitkeep
    │
    └───environments
            environment.prod.ts
            environment.ts

Ref: TOOL-699

Closes #12326

[clydin]

I think we should keep the E2E directory just move it into the src directory. They are really run/compiled completely separate from the actual application unlike the unit tests which are compiled into the application.

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