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Replace ReferencingServers with structured ReferencingWorkloads on MCPOIDCConfig (#4492)

RFC-0023 specifies a structured referencingWorkloads list with kind and
name fields rather than plain strings. This replaces the
ReferencingServers []string field on MCPOIDCConfig with
ReferencingWorkloads []WorkloadReference, a new type with Kind and Name
fields that explicitly identifies each referencing workload.

The WorkloadReference type supports MCPServer, VirtualMCPServer, and
MCPRemoteProxy kinds, making the data model self-describing and
type-safe. The MCPServer controller and MCPOIDCConfig controller are
updated to use the new structured type throughout: reference tracking,
deletion protection, watch handlers, and status updates.

The same migration is needed for MCPToolConfig, MCPTelemetryConfig, and
MCPExternalAuthConfig — tracked in #4491.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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