Update interceptor usages with http:InterceptableService

[dilanSachi]

Purpose

Related to ballerina-platform/ballerina-library#4570

From U6 and U7 onwards we have deprecated the usage of interceptors in the http:ServiceConfig and http:ListenerConfiguration respectively. This PR is to update those usage and replace them with the recommended approach of using http:InterceptableService

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[TharmiganK]

LGTM