Send grafana address to DM

[qqqdan]

Feature Request

Is your feature request related to a problem? Please describe:

Describe the feature you'd like:

DM needs to know grafana address to set up the WebUI. Currently , it need user to input the address, which is not user-friendly. TiUP can help send the info to DM during deployment action. DM already provide the API for it : https://github.com/pingcap/tiflow/pull/5088

Expect action : Send grafana info to DM , during the following action :deploy/scale-out/scale-in/reload

Why the featue is needed:

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: