buildscripts: Use the Kokoro shared install lib from the new repo (grpc#10757) (grpc#10765)

Source: https://github.com/grpc/grpc/blob/4f7ead2c7b7b82ad80799bbfa482184991dcd346/tools/internal_ci/linux/grpc_xds_k8s_install_test_driver.sh
New repo: https://github.com/grpc/psm-interop
New path: `.kokoro/psm_interop_kokoro_lib.sh`

Author: sergiitk

buildscripts/kokoro/psm-security.sh

@@ -3,7 +3,7 @@ set -eo pipefail
 
 # Constants
 readonly GITHUB_REPOSITORY_NAME="grpc-java"
-readonly TEST_DRIVER_INSTALL_SCRIPT_URL="https://raw.githubusercontent.com/${TEST_DRIVER_REPO_OWNER:-grpc}/grpc/${TEST_DRIVER_BRANCH:-master}/tools/internal_ci/linux/grpc_xds_k8s_install_test_driver.sh"
+readonly TEST_DRIVER_INSTALL_SCRIPT_URL="https://raw.githubusercontent.com/${TEST_DRIVER_REPO_OWNER:-grpc}/psm-interop/${TEST_DRIVER_BRANCH:-main}/.kokoro/psm_interop_kokoro_lib.sh"
 ## xDS test server/client Docker images
 readonly SERVER_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/java-server"
 readonly CLIENT_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/java-client"

buildscripts/kokoro/xds_k8s_lb.sh

@@ -3,7 +3,7 @@ set -eo pipefail
 
 # Constants
 readonly GITHUB_REPOSITORY_NAME="grpc-java"
-readonly TEST_DRIVER_INSTALL_SCRIPT_URL="https://raw.githubusercontent.com/${TEST_DRIVER_REPO_OWNER:-grpc}/grpc/${TEST_DRIVER_BRANCH:-master}/tools/internal_ci/linux/grpc_xds_k8s_install_test_driver.sh"
+readonly TEST_DRIVER_INSTALL_SCRIPT_URL="https://raw.githubusercontent.com/${TEST_DRIVER_REPO_OWNER:-grpc}/psm-interop/${TEST_DRIVER_BRANCH:-main}/.kokoro/psm_interop_kokoro_lib.sh"
 ## xDS test server/client Docker images
 readonly SERVER_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/java-server"
 readonly CLIENT_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/java-client"

buildscripts/kokoro/xds_url_map.sh

@@ -3,7 +3,7 @@ set -eo pipefail
 
 # Constants
 readonly GITHUB_REPOSITORY_NAME="grpc-java"
-readonly TEST_DRIVER_INSTALL_SCRIPT_URL="https://raw.githubusercontent.com/${TEST_DRIVER_REPO_OWNER:-grpc}/grpc/${TEST_DRIVER_BRANCH:-master}/tools/internal_ci/linux/grpc_xds_k8s_install_test_driver.sh"
+readonly TEST_DRIVER_INSTALL_SCRIPT_URL="https://raw.githubusercontent.com/${TEST_DRIVER_REPO_OWNER:-grpc}/psm-interop/${TEST_DRIVER_BRANCH:-main}/.kokoro/psm_interop_kokoro_lib.sh"
 ## xDS test client Docker images
 readonly SERVER_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/java-server"
 readonly CLIENT_IMAGE_NAME="gcr.io/grpc-testing/xds-interop/java-client"