BCH-1295: Add resource_arn label for e2e assert.sh compatibility

[saltpy-cs]

Summary

• Add resource_arn label to cluster, nodegroup, and addon evidence contexts in internal/evidence.go
• Required by local-dev/e2e/lib/assert.sh which matches evidence to Terraform output ARNs via $labels.resource_arn == $arn
• ECR plugin already sets this label; EKS plugin was missing it, which would cause all e2e assertions to fail

Test plan

• All existing unit tests pass (go test ./... — 2 packages, 0 failures)
• Manually verified label map contains resource_arn matching the type-specific ARN field for cluster, nodegroup, and addon

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 5a1707b and d72cfa0.

📒 Files selected for processing (1)

• internal/evidence.go

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