Deprecate / remove experimentalAngularNext

[alan-agius4]

Following this PR #12709

We no longer use experimentalAngularNext in our code base and this is a hidden option.

angular-cli/packages/schematics/angular/workspace/schema.json

Lines 16 to 20 in f52f043

	"experimentalAngularNext": {
	"description": "Use the next version of Angular (@next dist-tag).",
	"type": "boolean",
	"visible": "false"
	},

If removed, we can clean up:

angular-cli/packages/schematics/angular/workspace/files/package.json

Lines 14 to 30 in f52f043

	"@angular/animations": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/common": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/compiler": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/core": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/forms": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/platform-browser": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/platform-browser-dynamic": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/router": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"core-js": "^2.5.4",
	"rxjs": "<%= latestVersions.RxJs %>",
	"tslib": "<%= latestVersions.TsLib %>",
	"zone.js": "<%= latestVersions.ZoneJs %>"
	},
	"devDependencies": {
	"@angular/cli": "<%= experimentalAngularNext ? 'next' : '~' + version %>",
	"@angular/compiler-cli": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",
	"@angular/language-service": "<%= experimentalAngularNext ? 'next' : latestVersions.Angular %>",

In our next team meeting we should discuss if to remove this option since it's hidden and experimental or deprecate this and remove it in V8.

[alexeagle]

I think we can just remove this one since it wasn't documented.

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