Fix go integration test case failures

[sgayangi]

Description

There are several go integration test case failures in the latest PR runs that need to be fixed.

Failures

• TestIntegration/FetchAPIDefinition/FetchAPIDefinition#01 (30.00s)
• TestIntegration/FetchAPIDefinition/FetchAPIDefinition (30.00s)
• TestIntegration/ResourceLevelJWT/0_request_to_'resource-level-jwt.test.gw.wso2.com/resource-level-jwt/v1.0.0/v2/echo-full'_with_headers_should_go_to_infra-backend-v1 (30.00s)
• TestIntegration/ResourceLevelJWT/4_request_to_'resource-level-jwt.test.gw.wso2.com/resource-level-jwt/v1.0.0/v2/echo-2'_with_headers_should_go_to_infra-backend-v1 (30.00s)
• TestIntegration/APIWithoutBackendBasePath/0_request_to_'no-base-path.test.gw.wso2.com/no-basepath/v1'_with_headers_should_go_to_infra-backend-v1
• TestIntegration/APIWithCORSPolicy/4_request_to_'cors-policy.test.gw.wso2.com/cors-policy-api/test'_with_headers_should_receive_a_200
• TestIntegration/APIWithCORSPolicy/1_request_to_'cors-policy.test.gw.wso2.com/cors-policy-api/1.0.0/test'_with_headers_should_receive_a_200
• TestIntegration/CustomAuthHeaderTest/5_request_to_'custom-auth-header.test.gw.wso2.com/custom-auth-header/v2/echo-full/'_with_headers_should_go_to_infra-backend-v1
• TestIntegration/CustomAuthHeaderTest/4_request_to_'custom-auth-header.test.gw.wso2.com/custom-auth-header/v1.0.0/v2/echo-full/'_with_headers_should_go_to_infra-backend-v1
• TestIntegration/VerifyOldAPIs/0_request_to_'prod-api.test.gw.wso2.com/verify-old-apis/v1'_with_headers_should_go_to_infra-backend-v1