ci: add workflow to test default targetAllocator image

[NavaMaklev]

Summary

Add CI validation for target allocator image in opentelemetry-operator Helm chart.

Motivation

Issue #929 describes a failure in version 0.87.0 where the target allocator image wasn’t deployed.
This change integrates a CI check that:

• Enables manager.targetAllocator via Helm,
• Verifies the target allocator pod becomes ready.

This prevents regressions in future releases.

Changes

• Added GitHub workflow: .github/workflows/operator-test.yaml
• Workflow runs ct install with --set manager.targetAllocator.enabled=true and waits for target allocator pod readiness.

Testing

• ✅ Ran ct install locally — chart installs successfully with target allocator pod.
• ✅ Verified GitHub Actions workflow execution (pending merge).

Related Issue

Closes #929

[linux-foundation-easycla]

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[NavaMaklev]

Hi there 👋

I'm trying to contribute to this project as an individual, but I encountered a message from EasyCLA stating that the Individual CLA option is not enabled for this repository.

Could you please advise on how I should proceed? I’m not contributing on behalf of any organization, and I want to ensure my contribution complies with the project's requirements.

Thank you very much for your help!

Best regards,
Nava