ci(bigtable): add Kokoro presubmit config for session integration tests

Author: mutianf

.kokoro/presubmit/bigtable-session-integration.cfg

@@ -0,0 +1,43 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java11"
+}
+
+env_vars: {
+    key: "INTEGRATION_TEST_ARGS"
+    value: "-P bigtable-session-it,enable-verbose-grpc-logs -Dbigtable.session-project=gcloud-devel -Dbigtable.session-instance=google-cloud-bigtable-session -Dbigtable.session-table=integration-tests"
+}
+
+env_vars: {
+  key: "JOB_TYPE"
+  value: "integration-single"
+}
+
+# TODO: remove this after we've migrated all tests and scripts
+env_vars: {
+  key: "GCLOUD_PROJECT"
+  value: "gcloud-devel"
+}
+
+env_vars: {
+  key: "GOOGLE_CLOUD_PROJECT"
+  value: "gcloud-devel"
+}
+
+env_vars: {
+  key: "GOOGLE_APPLICATION_CREDENTIALS"
+  value: "secret_manager/java-it-service-account"
+}
+
+env_vars: {
+  key: "SECRET_MANAGER_KEYS"
+  value: "java-it-service-account"
+}
+
+env_vars: {
+  key: "BUILD_SUBDIR"
+  value: "java-bigtable"
+}