docs: remove long-description from schematics

These long descriptions were and are only handled at the Angular CLI level which makes these redundant.

Author: alan-agius4

packages/schematics/angular/BUILD.bazel

@@ -142,11 +142,8 @@ pkg_npm(
         "//packages/angular_devkit/core:package.json",
     ],
     deps = [
-        "library/library-long.md",
         ":README.md",
         ":angular",
-        ":app-shell/app-shell-long.md",
-        ":e2e/e2e-long.md",
         ":license",
         ":migrations/migration-collection.json",
         ":utility/latest-versions/package.json",

packages/schematics/angular/app-shell/app-shell-long.md

@@ -5,7 +5,6 @@
   "type": "object",
   "description": "Generates an application shell for running a server-side version of an app.",
   "additionalProperties": false,
-  "long-description": "./app-shell-long.md",
   "properties": {
     "project": {
       "type": "string",

packages/schematics/angular/app-shell/schema.json

@@ -5,7 +5,6 @@
   "type": "object",
   "additionalProperties": false,
   "description": "Generates a new, generic end-to-end test definition for the given or default project.",
-  "long-description": "e2e-long.md",
   "properties": {
     "rootSelector": {
       "description": "The HTML selector for the root component of the test app.",

packages/schematics/angular/e2e/e2e-long.md

@@ -4,7 +4,6 @@
   "title": "Library Options Schema",
   "type": "object",
   "description": "Creates a new, generic library project in the current workspace.",
-  "long-description": "./library-long.md",
   "additionalProperties": false,
   "properties": {
     "name": {