[Feature] Improve RayService Event logs and better naming

[brucez-anyscale]

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• [X] I had searched in the issues and found no similar feature requirement.

Description

--- 1 --- Based on the bug bash of RayService. We would like to improve the event log message.

1. Make it less frightening with better event like wait for ray cluster ready instead of fail to deploy
2. Add more events when update serve config. For example: When the serve deployment is running healthy, and then users apply a new serve config. RayService should record an event for ServeDeploymentConfigUpdateFailed or ServeDeploymentConfigUpdateSucceed

--- 2 --- Now the 4 services created by RayCluster and RayService have names that are hard to understand. Give them better naming.

--- 3 --- In states: we have

Health Last Update Time
Last Update Time

Seems the naming is hard to understand.
Health Last Update Time: record the last timestamp that RayCluster is healthy Last Update Time: record the last timestamp that RayCluster is checked for health

Use case

No response

Related issues

No response

Are you willing to submit a PR?

• [ ] Yes I am willing to submit a PR!