Fix ExternalName service handling and add standardized workload mappings

[allanhung]

Summary

This PR addresses service handling issues and adds support for standardized workload type mappings in the Otterize intents operator.

Changes

1. ExternalName Service Handling

Fixed handling of Kubernetes ExternalName services (e.g., Knative services) that don't have pod selectors:

• Files modified: api/v1alpha3/otterize_labels.go, api/v1beta1/otterize_labels.go, api/v2alpha1/otterize_labels.go, api/v2beta1/otterize_labels.go
• Change: Return (nil, false, nil) instead of error when service has no selector
• Impact: Prevents errors when processing ExternalName services

2. Standardized Workload Type Mappings

Added standardized service name mappings for specific workload types to provide consistent policy application:

Existing workloads (from first commit):

• Workflow (Argo) → argo-workflow
• SparkApplication → spark
• RunnerDeployment (GitHub Actions) → actions-runner

New workload (from second commit):

• Execution (Canalflow) → execution

3. Test Coverage

Added comprehensive unit tests:

• TestResolvePodToServiceIdentity_WorkflowOwner
• TestResolvePodToServiceIdentity_SparkApplicationOwner
• TestResolvePodToServiceIdentity_RunnerDeploymentOwner
• TestResolvePodToServiceIdentity_ExecutionOwner

Testing

• ✅ All unit tests pass
• ✅ Code compiles successfully
• ✅ Test coverage added for all new functionality

Files Changed

• src/operator/api/v1alpha3/otterize_labels.go
• src/operator/api/v1beta1/otterize_labels.go
• src/operator/api/v2alpha1/otterize_labels.go
• src/operator/api/v2beta1/otterize_labels.go
• src/shared/serviceidresolver/podownerresolver/podownerresolver.go
• src/shared/serviceidresolver/serviceidresolver_test.go

Total: 6 files changed, 277 insertions(+)

🤖 Generated with Claude Code

[github-actions]

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- Name: Allan Hung
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[allanhung]

Wrong target repository, creating PR to fork instead