fix mcp controller and test status propagation

[yrobla]

Properly reconcile mcpserver status, and subsequentially, the vmcp status. Add tests to validate that status is propagated

[Copilot]

Pull request overview

This PR fixes MCP controller status propagation to ensure that backend health changes are properly reflected in VirtualMCPServer status. The key improvements include detecting container errors (ImagePullBackOff, CrashLoopBackOff) in MCPServer pods to transition them to Failed state, propagating MCPServer phase to VirtualMCPServer backend status, and updating VirtualMCPServer phase to Degraded when backends are unavailable.

• Adds container error detection in MCPServer status reconciliation to properly mark pods as Failed
• Implements backend health-based phase determination for VirtualMCPServer (Ready/Degraded states)
• Updates BackendCount to only count ready backends while DiscoveredBackends tracks all backends
• Adds comprehensive E2E test validating status transitions when backends become unhealthy and recover

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
test/e2e/thv-operator/virtualmcp/virtualmcp_yardstick_base_test.go	Adds E2E test validating VirtualMCPServer status transitions from Ready to Degraded when backends fail, and back to Ready when recovered
cmd/thv-operator/pkg/virtualmcpserverstatus/collector.go	Updates BackendCount calculation to only count ready backends instead of all discovered backends
cmd/thv-operator/controllers/virtualmcpserver_controller.go	Adds backend status constants and logic to set VirtualMCPServer phase to Degraded when backends are unavailable; ensures MCPServer phase propagates to backend status
cmd/thv-operator/controllers/mcpserver_controller.go	Adds helper functions to detect container errors (ImagePullBackOff, CrashLoopBackOff) and categorize pods as Failed instead of Pending when containers are in error states

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