Use convert runtime API and enable disabled tests in http

[Nadeeshan96]

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1. In some standard libraries cloneWithType.convert(), fromJsonWithType.convert(), cloneWithType, and fromJsonWithType java methods are used in the native code. After fixing Provide a runtime API to clone a value to a type ballerina-lang#35141, we can use this instead of them. We need to replace the usages to use the runtime API.
   https://github.com/search?l=Java&q=org%3Aballerina-platform+CloneWithType&type=Code
   https://github.com/search?l=Java&q=org%3Aballerina-platform+FromJsonWithType&type=Code

2. Need to enable tests disabled by Fix and disable some service dispatching tests module-ballerina-http#1409

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[Nadeeshan96]

Closing the issue since the task is done.