fix(cdk/tree): revert to ng_test_library; ng_module tests don't work in CI

Author: BobobUnicorn

src/cdk/tree/BUILD.bazel

@@ -2,6 +2,7 @@ load(
     "//tools:defaults.bzl",
     "markdown_to_html",
     "ng_module",
+    "ng_test_library",
     "ng_web_test_suite",
 )
 
@@ -25,9 +26,8 @@ ng_module(
     ],
 )
 
-ng_module(
+ng_test_library(
     name = "unit_test_sources",
-    testonly = True,
     srcs = glob(
         ["**/*.spec.ts"],
         exclude = ["**/*.e2e.spec.ts"],
@@ -39,8 +39,7 @@ ng_module(
         "//src/cdk/collections",
         "//src/cdk/keycodes",
         "//src/cdk/testing/testbed",
-        "@npm//@angular/core",
-        "@npm//@types/jasmine",
+        "@npm//@angular/common",
         "@npm//rxjs",
     ],
 )