chore(ci): adding datadog-lambda-python CI to Gitlab

.gitlab-ci.yml

@@ -120,6 +120,26 @@ run-tests-trigger:
        job: tests-gen
    strategy: depend
 
+serverless lambda tests:
+  stage: tests
+  trigger:
+    project: DataDog/datadog-lambda-python
+    strategy: depend
+    branch: main
+  needs:
+    - job: publish-wheels-to-s3
+  variables:
+    UPSTREAM_PIPELINE_ID: $CI_PIPELINE_ID
+    UPSTREAM_PROJECT_URL: $CI_PROJECT_URL
+    UPSTREAM_COMMIT_BRANCH: $CI_COMMIT_BRANCH
+    UPSTREAM_COMMIT_AUTHOR: $CI_COMMIT_AUTHOR
+    UPSTREAM_COMMIT_TITLE: $CI_COMMIT_TITLE
+    UPSTREAM_COMMIT_TAG: $CI_COMMIT_TAG
+    UPSTREAM_PROJECT_NAME: $CI_PROJECT_NAME
+    UPSTREAM_GITLAB_USER_LOGIN: $GITLAB_USER_LOGIN
+    UPSTREAM_GITLAB_USER_EMAIL: $GITLAB_USER_EMAIL
+    SKIP_E2E_TESTS: "true"
+
 # Validate the ast-grep rule's test suite in .sg/tests
 "ast-grep rules":
   extends: .testrunner