removed unused grpc_bazel_test kokoro job (#28965)

tools/internal_ci/linux/grpc_bazel_test.cfg

@@ -1,23 +0,0 @@
-# Copyright 2017 gRPC authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Config file for the internal CI (in protobuf text format)
-
-# Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/linux/grpc_bazel.sh"
-timeout_mins: 240
-env_vars {
-  key: "BAZEL_SCRIPT"
-  value: "tools/internal_ci/linux/grpc_bazel_test_in_docker.sh"
-}

tools/internal_ci/linux/grpc_bazel_test_in_docker.sh

@@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2017 gRPC authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-# Test full Bazel
-#
-# NOTE: No empty lines should appear in this file before igncr is set!
-set -ex -o igncr || set -ex
-
-mkdir -p /var/local/git
-git clone /var/local/jenkins/grpc /var/local/git/grpc
-(cd /var/local/jenkins/grpc/ && git submodule foreach 'cd /var/local/git/grpc \
-&& git submodule update --init --reference /var/local/jenkins/grpc/${name} \
-${name}')
-cd /var/local/git/grpc
-
-bazel test //test/...
-bazel test //test/cpp/end2end:admin_services_end2end_test --define=grpc_no_xds=true