fix(@schematics/angular): address vulnerability in protractor

[alan-agius4]

potractor <7 contains a low severity vulnerability due to one of its dependencies (yargs-parser)

See: https://npmjs.com/advisories/1500

Fixes #17642

Protractor elementExplorer debugger and element explorer cannot be used for Node.js 8+ since it relied on _debugger module.

In protractor version 5, this resulted in the below error:

** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
: Compiled successfully.
[10:25:35] I/direct - Using ChromeDriver directly...
[10:25:37] I/protractor -
[10:25:37] I/protractor - ------- Element Explorer -------
[10:25:37] I/protractor - Starting WebDriver debugger in a child process. Element Explorer is still beta, please report issues at github.com/angular/protractor
[10:25:37] I/protractor -
[10:25:37] I/protractor - Type <tab> to see a list of locator strategies.
[10:25:37] I/protractor - Use the `list` helper function to find elements by strategy:
[10:25:37] I/protractor -   e.g., list(by.binding('')) gets all bindings.
[10:25:37] I/protractor -
***********************************************************
* WARNING: _debugger module not available on Node.js 8    *
* and higher.                                             *
*                                                         *
* Use 'debugger' keyword instead:                       *
* https://goo.gl/MvWqFh                                   *
***********************************************************
/Users/alanagius/cli-repos/demo-several/node_modules/protractor/built/debugger/debuggerCommons.js:14
  throw e;
  ^

Error: Cannot find module '_debugger'
Require stack:
- /Users/alanagius/cli-repos/demo-several/node_modules/protractor/built/debugger/debuggerCommons.js
- /Users/alanagius/cli-repos/demo-several/node_modules/protractor/built/debugger/clients/explorer.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:980:15)
    at Function.Module._load (internal/modules/cjs/loader.js:862:27)
    at Module.require (internal/modules/cjs/loader.js:1042:19)
    at require (internal/modules/cjs/helpers.js:77:18)
    at Object.<anonymous> (/Users/alanagius/cli-repos/demo-several/node_modules/protractor/built/debugger/debuggerCommons.js:3:18)
    at Module._compile (internal/modules/cjs/loader.js:1156:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
    at Module.require (internal/modules/cjs/loader.js:1042:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/Users/alanagius/cli-repos/demo-several/node_modules/protractor/built/debugger/debuggerCommons.js',
    '/Users/alanagius/cli-repos/demo-several/node_modules/protractor/built/debugger/clients/explorer.js'
  ]
}

but in protractor version 7, this logic was removed.

BREAKING CHANGE:
Protractor builder elementExplorer option has been removed. This was not compatable with the Node.Js versions that the Angular CLI supports. See: https://github.com/angular/protractor/blob/master/docs/debugging.md#enabled-control-flow for an alternative debugging methods.

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