fix(@angular-devkit/core): remove unimplemented prompt priority

Node.js versions prior to 11 used an unstable sort for arrays with a length greater than 10.  This caused the prompt order of a schematic with more than 10 prompts to be inconsistent the the content of the file and the same schematic with several of the prompts removed.  Since priorities were never fully implemented and property dependencies will most likely be used at a higher level instead, the underlying elements have been removed with this change.

Fixes angular#14402

Author: clydin

etc/api/angular_devkit/core/src/_golden-api.d.ts

@@ -796,7 +796,6 @@ export interface PromptDefinition {
     }>;
     message: string;
     multiselect?: boolean;
-    priority: number;
     raw?: string | JsonObject;
     type: string;
     validator?: (value: string) => boolean | string | Promise<boolean | string>;

packages/angular_devkit/core/src/json/schema/interface.ts

@@ -100,7 +100,6 @@ export interface PromptDefinition {
   type: string;
   message: string;
   default?: string | string[] | number | boolean | null;
-  priority: number;
   validator?: (value: string) => boolean | string | Promise<boolean | string>;
 
   items?: Array<string | { value: JsonValue, label: string }>;

packages/angular_devkit/core/src/json/schema/registry.ts

@@ -569,7 +569,6 @@ export class CoreSchemaRegistry implements SchemaRegistry {
           id: path,
           type,
           message,
-          priority: 0,
           raw: schema,
           items,
           multiselect: type === 'list' ? schema.multiselect : false,
@@ -625,8 +624,6 @@ export class CoreSchemaRegistry implements SchemaRegistry {
       return of(data);
     }
 
-    prompts.sort((a, b) => b.priority - a.priority);
-
     return from(provider(prompts)).pipe(
       map(answers => {
         for (const path in answers) {