docs(@angular/cli): Add Nightwatch schematics to e2e command

[vaibhavsingh97]

Overview
Added Nightwatch Schematic to e2e command. Nightwatch schematics would add both schematics and custom builder to Angular Project.

Ref:
https://github.com/nightwatchjs/nightwatch-schematics
https://www.npmjs.com/package/@nightwatch/schematics

[alan-agius4]

LGTM, since this appears to be a supported by nightwatch.

That said, I'll going to mark this for further discussion just to make sure that everyone on the team is onboard with this.

[AutomatedTester]

Hi @alan-agius4 and @kyliau

Is there anything else we(@vaibhavsingh97 or myself) can do here to get the update landed?

[alan-agius4]

@dgp1130 reached out to our devrels @twerske and @mgechev to see if there is any concern from their end about this change.

[mgechev]

No concerns on our end. Our general policy is to have a set of e2e tests running against the lasted build artifacts. You can keep up to date with renovatebot. Since the builder is already maintained by your team, we'd love to have it as an option.

[AutomatedTester]

@mgechev We have https://github.com/nightwatchjs/nightwatch-schematics/blob/main/src/schematics/nightwatch/index_spec.ts. Would you want us to add tests to this repo or are those good enough? We're happy to add in anything you suggest here.

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