[Task]: Replace `assert` statements with proper assertion error

[HindujaB]

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As the execution of assert statements is controlled by JVM arguments, using them in the codebase is not recommended.

https://github.com/ballerina-platform/ballerina-lang/blob/c79ac50f6ab566fd1e903285160ba5d5e6256bd8/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/codegen/split/JvmCreateTypeGen.java#L610

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