Fix readiness probe command argument handling

[Al-assad]

Summary

• pass TLS certificate paths to readiness probes as command arguments
• execute non-FQDN TLS probes directly with curl
• preserve the FQDN DNS check while parameterizing curl values
• add coverage for TLS and FQDN command construction

Testing

• go test ./pkg/common/utils/resource
• go vet ./...
• go build -o /tmp/dorisoperator-pr-check ./cmd/operator
• make manifests generate
• validated FQDN and non-FQDN TLS readiness probes on Kubernetes with yulinying/xxx@sha256:f461e8383c1e757ed1a3ebae1130ceed2bfd43c34910cbb29b35ba7f73980a2c