Workflowdefault configmap at the namespace level

[shuangkun]

Summary

Now workflowdefault is global, and the operation and maintenance team hopes to configure workflow default at the namespace level, just like artifacts.

Use Cases

1. The operation and maintenance team only wants to operate and maintain one argo instance and does not want to install argo in multiple namespaces
2. Support multiple business parties in different namespace,
   a. For example, CI/CD business, using CI namespace, requires global labeling of CI tags to facilitate statistics of metrics.
   b. Data business, using data namespace, requires all pods to inject initcontaienr to prepare data.
   c. ML business, using ml namespace, requires all pods to inject a sidecar.

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