[DSIP-36][Helm] split application.yaml as configmap to control db/registry

[pegasas]

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Motivation

Like https://github.com/apache/dolphinscheduler/blob/dev/deploy/kubernetes/dolphinscheduler/templates/configmap.yaml and discuss in #15922 (comment),

We could put application.yaml into configmap, and make some important items of application.yaml as variables and access them through values.yaml.

mainly focus on datasource & registry configuration in stage 1

involves #14102 and #15473

Design Detail

We could put application.yaml into configmap, and make some important items of application.yaml as variables and access them through values.yaml. For example api server, alert server and master server all need access to db and there are db related configs in the application.yaml for all of them. So you may put db related configs in values.yaml, and share those configs across different application.yaml for alert server, api server and master server. The same for registry related configs.

Compatibility, Deprecation, and Migration Plan

1.split api/master/worker/alert application into configmap, keep the same as docker
2.put datasource & registry configuration into values.yaml and make it disable
3.make it enable
4.remove old configuration

Test Plan

Test by UT and E2E

Code of Conduct

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