refactor(@angular-devkit/build-angular): deprecate showCircularDependencies

Author: alan-agius4

packages/angular_devkit/build_angular/src/browser/schema.json

@@ -290,7 +290,8 @@
     "showCircularDependencies": {
       "type": "boolean",
       "description": "Show circular dependency warnings on builds.",
-      "default": false
+      "default": false,
+      "x-deprecated": "The recommended method to detect circular dependencies in project code is to use a either a lint rule or other external tooling."
     },
     "buildOptimizer": {
       "type": "boolean",

packages/angular_devkit/build_angular/src/server/schema.json

@@ -187,7 +187,8 @@
     "showCircularDependencies": {
       "type": "boolean",
       "description": "Show circular dependency warnings on builds.",
-      "default": false
+      "default": false,
+      "x-deprecated": "The recommended method to detect circular dependencies in project code is to use a either a lint rule or other external tooling."
     },
     "namedChunks": {
       "type": "boolean",