Add null checks and default values for backend related metric properties #12211
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This PR adds null checks and default values for backend related metric properties.
When a respond mediator is included in the request path, the gateway will not forward the request to the backend. In such cases, we need to populate the metrics related to backend in order to avoid errors in the flow. The following metrics were handled through this PR.
Related issue: https://github.com/wso2-enterprise/wso2-apim-internal/issues/5285
Fixes wso2/api-manager#2364