[WIP] Fix liveness probe and add readiness probe in deployment

[Copilot]

Fix duplicate liveness probes in key-manager deployment

• Explore repository and understand the issue
• Identify the problem: two livenessProbe sections on lines 156 and 163 in 4.6.x branch
• Change second livenessProbe to readinessProbe (line 163)
• Update probe configuration values to use readinessProbe values (lines 167-169)
• Verify the changes with helm lint - passed successfully
• Validate consistency with other deployment files - confirmed alignment with gateway, control-plane, and traffic-manager deployments
• Commit changes
• Run code review - no issues found
• Run security scan with CodeQL - no issues detected

Summary: Successfully fixed the duplicate livenessProbe issue in the key-manager deployment template. The second probe has been changed to readinessProbe and now uses the appropriate readinessProbe configuration values. This change aligns the key-manager deployment with all other deployment files in the repository.

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