[PSM Interop] Point Interop Prod testing to new repo (#35305)

Tests:
* [x] [prod:grpc/java/v1.59.x/branch/psm-security](https://source.cloud.google.com/results/invocations/b452f79c-4766-4e0f-99fb-cbbf38a8529b)
* [x] [prod:grpc/java/v1.59.x/branch/xds_k8s_lb](https://source.cloud.google.com/results/invocations/5f3baf85-3710-47b4-b1bb-df690c295e33)
* [x] [prod:grpc/java/v1.59.x/branch/xds_url_map](https://source.cloud.google.com/results/invocations/61d45275-ebe7-412c-ae0a-c8932535b343)
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Closes #35305

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35305 from XuanWang-Amos:switch_interop_repo 4e01258f1b
PiperOrigin-RevId: 590776638

tools/internal_ci/linux/grpc_xds_k8s_install_test_driver.sh

@@ -18,11 +18,11 @@ set -eo pipefail
 # Constants
 readonly PYTHON_VERSION="${PYTHON_VERSION:-3.10}"
 # Test driver
-readonly TEST_DRIVER_REPO_NAME="grpc"
-readonly TEST_DRIVER_REPO_URL="https://github.com/${TEST_DRIVER_REPO_OWNER:-grpc}/grpc.git"
-readonly TEST_DRIVER_BRANCH="${TEST_DRIVER_BRANCH:-master}"
-readonly TEST_DRIVER_PATH="tools/run_tests/xds_k8s_test_driver"
-readonly TEST_DRIVER_PROTOS_PATH="src/proto/grpc/testing"
+readonly TEST_DRIVER_REPO_NAME="psm-interop"
+readonly TEST_DRIVER_REPO_URL="https://github.com/${TEST_DRIVER_REPO_OWNER:-grpc}/psm-interop.git"
+readonly TEST_DRIVER_BRANCH="${TEST_DRIVER_BRANCH:-main}"
+readonly TEST_DRIVER_PATH=""
+readonly TEST_DRIVER_PROTOS_PATH="protos/grpc/testing"
 readonly FORCE_TESTING_VERSION="${FORCE_TESTING_VERSION:-}"
 
 # GKE cluster identifiers.
@@ -261,7 +261,7 @@ test_driver_pip_install() {
 #   Writes the output of `python -m grpc_tools.protoc` to stdout, stderr
 #   Writes the list if compiled python code to stdout
 #   Writes compiled python code with proto messages and grpc services to
-#   $TEST_DRIVER_FULL_DIR/src/proto
+#   $TEST_DRIVER_FULL_DIR/protos/grpc/testing
 #######################################
 test_driver_compile_protos() {
   declare -a protos
@@ -296,7 +296,7 @@ test_driver_compile_protos() {
 #######################################
 test_driver_install() {
   readonly TEST_DRIVER_REPO_DIR="${1:?Usage test_driver_install TEST_DRIVER_REPO_DIR}"
-  readonly TEST_DRIVER_FULL_DIR="${TEST_DRIVER_REPO_DIR}/${TEST_DRIVER_PATH}"
+  readonly TEST_DRIVER_FULL_DIR="${TEST_DRIVER_REPO_DIR}"
   test_driver_get_source
   test_driver_pip_install
   test_driver_compile_protos