style: enforce buildifier lint rules (#29019)

PR Close #29019

packages/bazel/src/ng_module.bzl

@@ -545,7 +545,7 @@ NG_MODULE_ATTRIBUTES = {
 }
 
 NG_MODULE_RULE_ATTRS = dict(dict(COMMON_ATTRIBUTES, **NG_MODULE_ATTRIBUTES), **{
-    "tsconfig": attr.label(allow_files = True, single_file = True),
+    "tsconfig": attr.label(allow_single_file = True),
     "node_modules": attr.label(
         doc = """The npm packages which should be available during the compile.
 

packages/bazel/src/protractor/protractor_web_test.bzl

@@ -149,14 +149,12 @@ _protractor_web_test = rule(
             doc = "Optional server executable target",
             executable = True,
             cfg = "target",
-            single_file = False,
             allow_files = True,
         ),
         "protractor": attr.label(
             doc = "Protractor executable target (set by protractor_web_test macro)",
             executable = True,
             cfg = "target",
-            single_file = False,
             allow_files = True,
         ),
         "_conf_tmpl": attr.label(

packages/bazel/src/schematics/BUILD.bazel

@@ -8,7 +8,7 @@ filegroup(
     visibility = ["//packages/bazel:__subpackages__"],
 )
 
-load("//tools:defaults.bzl", "jasmine_node_test", "ts_library")
+load("//tools:defaults.bzl", "jasmine_node_test")
 
 jasmine_node_test(
     name = "test",