refactor(@angular-devkit/schematics): remove legacy secondary entrypoint package.json files

Subpath exports in @angular-devkit/schematics package.json explicitly define all entry points (./tasks, ./testing, and ./tools), making the nested package.json files redundant.

Author: alan-agius4

packages/angular_devkit/schematics/BUILD.bazel

@@ -71,10 +71,8 @@ npm_package(
         ":license",
         ":schematics",
         "//packages/angular_devkit/schematics/tasks",
-        "//packages/angular_devkit/schematics/tasks:package.json",
         "//packages/angular_devkit/schematics/testing",
-        "//packages/angular_devkit/schematics/testing:package.json",
-        "//packages/angular_devkit/schematics/tools:package.json",
+        "//packages/angular_devkit/schematics/tools",
     ],
 )
 

packages/angular_devkit/schematics/tasks/BUILD.bazel

@@ -17,7 +17,6 @@ ts_project(
             "**/*_spec.ts",
         ],
     ),
-    data = ["package.json"],
     deps = [
         "//:node_modules/@types/node",
         "//packages/angular_devkit/schematics",

packages/angular_devkit/schematics/tasks/package.json

@@ -13,7 +13,6 @@ ts_project(
     srcs = glob(
         include = ["**/*.ts"],
     ),
-    data = ["package.json"],
     deps = [
         "//packages/angular_devkit/schematics",
         "//packages/angular_devkit/schematics:node_modules/@angular-devkit/core",

packages/angular_devkit/schematics/testing/BUILD.bazel

@@ -16,7 +16,6 @@ ts_project(
             "**/*_spec.ts",
         ],
     ),
-    data = ["package.json"],
     deps = [
         "//:node_modules/@types/node",
         "//packages/angular_devkit/schematics",