Changes

feat(ticdc): new ticdc add mysql it pipeline (#3399)

Add two MySQL test integration testing pipelines for ticdc, related to
another PR https://github.com/pingcap/ticdc/pull/1025
* pull_cdc_mysql_integration_light
* pull_cdc_mysql_integration_heavy

To make better use of resources, the tests are divided into light(4
core) and heavy(12 core) based on CPU consumption.
The naming of the pipeline should be concise and clear:
cdc_${test_type}_integration_heavy, the value of test_type is mysql,
kafka, or other test types.
 (commit: 448c47c)