Changes

feat(pingcap/tidb): add integration test pipeline with tici (#4108)

Description
This PR adds a dedicated PR pipeline for the tici integration test. The
new job downloads required binaries via OCI artifacts, starts TiDB
components + MinIO + TiCDC, and runs tests/integrationtest2/run-tests.sh
-t tici/tici_integration. This isolates tici setup from
the general e2e job and allows iterative config changes without
impacting other tests.

  Changes

- Added pull_integration_tici_test.groovy and
pod-pull_integration_tici_test.yaml to run the tici integration test in
PR CI.
- Reused integrationtest2 harness and environment variables for
tici/minio.
 (commit: 0274cbc)