fix(raven): prevent stale gateway public Service/Endpoints on failover and multi-replica

[WorrierKhushal]

What type of PR is this?

/kind bug

What this PR does / why we need it:

The GatewayPublicService controller (pkg/yurtmanager/controller/raven/gatewaypublicservice/gateway_public_service_controller.go) derived Service/Endpoints object names only from (gatewayName, type), e.g. x-raven-proxy-svc-<gw>, while the classify logic (classifyService/classifyEndpoints) keyed objects by (nodeName, type). This mismatch meant:

• On failover (active endpoint moves nodeA -> nodeB), the reconcile tried to Create a Service for nodeB with the same name as the still-existing nodeA Service, hit AlreadyExists, and the code returned nil before the delete step for the stale nodeA object ever ran. The stale Service/Endpoints (pointing at the dead node) persisted forever, and reconcile kept reporting success.
• With ProxyConfig.Replicas: 2 (which the Gateway webhook explicitly allows for >=2 proxy endpoints), only the first endpoint's Service/Endpoints were ever created — the second Create hit the same AlreadyExists short-circuit and was silently dropped.

This PR:

• Includes the active endpoint's NodeName in the generated Service/Endpoints object names, so names uniquely match the classify key and no longer collide across nodes.
• Changes the AlreadyExists handling in manageService and manageEndpoints to reconcile the object as an update instead of aborting the reconcile, so the delete step for genuinely stale objects still runs.
• Adds TestReconcileService_TwoReplicas and TestReconcileService_Failover to cover both previously-broken scenarios with deterministic assertions (replacing the old err == nil-only check that passed even though only one endpoint was ever exposed).

Verified locally with:
go test ./pkg/yurtmanager/controller/raven/gatewaypublicservice/... -v
go test -race ./pkg/yurtmanager/controller/raven/gatewaypublicservice/... -v
go vet ./pkg/yurtmanager/controller/raven/...
golangci-lint run -v ./pkg/yurtmanager/controller/raven/gatewaypublicservice/...

All clean — 0 test failures, 0 vet issues, 0 lint issues.

Which issue(s) this PR fixes:

Fixes #2760

Special notes for your reviewer:

/assign @zyjhtangtang
corev1.Endpoints is used throughout this controller (not introduced by this PR) and is flagged by staticcheck (SA1019) as deprecated in favor of discoveryv1.EndpointSlice. Migrating to EndpointSlice is a much larger, separate refactor — this PR follows the existing repo convention of suppressing that specific warning with //nolint:staticcheck // SA1019: ..., matching the same directive already present in the production file and sibling test files in this package.

FormatName appends a random hash suffix to object names, so the new tests locate Services/Endpoints via the LabelCurrentGatewayEndpoints label rather than predicting exact names.

Does this PR introduce a user-facing change?

NONE

fix(raven): the public LoadBalancer Service/Endpoints for a raven Gateway are now correctly recreated on failover and correctly created for all active endpoints when ProxyConfig.Replicas > 1, instead of silently pointing at a dead node or exposing only one endpoint.

other Note

NONE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.54%. Comparing base (ddf22f7) to head (f8bf3a7).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2762      +/-   ##
==========================================
+ Coverage   46.20%   46.54%   +0.34%     
==========================================
  Files         405      405              
  Lines       27540    27567      +27     
==========================================
+ Hits        12724    12831     +107     
+ Misses      13649    13573      -76     
+ Partials     1167     1163       -4     

Flag	Coverage Δ
unittests	46.54% <100.00%> (+0.34%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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