[BUG] Filter Steve WebSocket errors.

[KevinJoiner]

Rancher Server Setup

• Rancher version: v2.7
• Installation option (Docker install/Helm Chart): Any

Information about the Cluster

• Kubernetes version: NA
• Cluster Type (Local/Downstream): N/A

User Information

• What is the role of the user logged in? (Admin/Cluster Owner/Cluster Member/Project Owner/Project Member/Custom)
  • If custom, define the set of permissions: N/A

Describe the bug
Steve was updated to send errors encountered when creating events to the frontend via resource.error messages.
Some of these errors are expected and harmless and thus should be suppressed and not sent to the frontend.

• clusters.provisioning.cattle.io "<resource_name" not found.
  These errors are caused by steve attempting to stream information about related resources that may or may not still exist.
  If the resource does not exist the message should be suppressed. Steve Code

• unable to decode an event from the watch stream: http2: response body closed
  These messages are sent when Steve closes the WebSocket via context cancelation. Resulting in the underlying k8s decoder for the watch command failing to read a valid object. apimachinery already checks for some of these types of error messages here, but does not handle this one since it is specific to the watch command
  Related to: [BUG] Creating/deleting management resources cause resources to be unsubscribed #40558

To Reproduce

1. Start a new rancher server
2. Inspect the WebSocket traffic for v1/subscribe
3. Create a new project and then delete the project

Result
Users observe the above error messages.

Expected Result
users observe new resource stop and start messages

Screenshots

Additional context

[richard-cox]

Users often quote these when providing logs / reporting issues and can really muddy the water. Hiding or downgrading them would help a lot.

Edit: We've had a few more cases where customers have supplied these thinking it's the root cause of their issue, which makes it harder for us to get the required part log section