xds_end2end_test: Move RLS tests to their own file (grpc#29290)

* move some code around

* remove num_backends parameter from XdsEnd2endTest

* remove use_xds_enabled_server param from XdsEnd2endTest

* remove xds_resource_does_not_exist_timeout_ms param from XdsEnd2endTest

* remove client_load_reporting_interval_seconds param from XdsEnd2endTest

* start moving CreateAndStartBackends() into individual tests

* finish moving CreateAndStartBackends() into individual tests

* remove unused variable

* remove SetEdsResourceWithDelay

* fix test flake

* clang-tidy

* clang-format

* move test framework to its own library

* fix build

* clang-format

* fix windows build

* rename TestType to XdsTestType

* move BackendServiceImpl inside of BackendServerThread

* clang-format

* move AdminServerThread to CSDS test suite

* move RLS tests to their own file

* remove unnecessary deps

* generate_projects

Author: markdroth

CMakeLists.txt

@@ -112,8 +112,6 @@ grpc_cc_test(
         "//:grpc",
         "//:grpc++",
         "//:grpc_resolver_fake",
-        "//src/proto/grpc/lookup/v1:rls_config_proto",
-        "//src/proto/grpc/lookup/v1:rls_proto",
         "//src/proto/grpc/testing:echo_messages_proto",
         "//src/proto/grpc/testing:echo_proto",
         "//src/proto/grpc/testing/duplicate:echo_duplicate_proto",
@@ -132,7 +130,6 @@ grpc_cc_test(
         "//src/proto/grpc/testing/xds/v3:router_proto",
         "//src/proto/grpc/testing/xds/v3:tls_proto",
         "//test/core/util:grpc_test_util",
-        "//test/cpp/end2end:rls_server",
         "//test/cpp/util:test_config",
         "//test/cpp/util:test_util",
         "//test/cpp/util:tls_test_utils",
@@ -190,6 +187,30 @@ grpc_cc_test(
     ],
 )
 
+grpc_cc_test(
+    name = "xds_rls_end2end_test",
+    size = "large",
+    srcs = ["xds_rls_end2end_test.cc"],
+    external_deps = [
+        "gtest",
+    ],
+    linkstatic = True,  # Fixes dyld error on MacOS
+    tags = [
+        "no_test_ios",
+        "no_windows",
+    ],  # TODO(jtattermusch): fix test on windows
+    deps = [
+        ":xds_end2end_test_lib",
+        "//:gpr",
+        "//:grpc",
+        "//:grpc++",
+        "//src/proto/grpc/lookup/v1:rls_config_proto",
+        "//src/proto/grpc/lookup/v1:rls_proto",
+        "//test/core/util:grpc_test_util",
+        "//test/cpp/end2end:rls_server",
+    ],
+)
+
 grpc_cc_test(
     name = "xds_credentials_end2end_test",
     srcs = ["xds_credentials_end2end_test.cc"],