Make the default name in function craetion node

[KavinduZoysa]

Purpose

Addresses wso2/product-ballerina-integrator#2515

Summary

This pull request refactors the default naming mechanism for function creation nodes in the Ballerina flow model generator. The changes establish a consistent pattern for defining and retrieving default function names across different node types.

Changes

Core Implementation Updates:

• Extract hardcoded function names into named constants (FUNCTION_NAME) in both the DataMapperCreationBuilder and FunctionCreationBuilder classes
• Introduce a protected getFunctionName() method in DataMapperCreationBuilder that returns the constant, and override it in FunctionCreationBuilder to return "function" instead of the parent class default "transform"
• This enables each builder class to define and maintain its own appropriate default function name

Test Data Updates:

• Update the test configuration file to reflect the new default function name value ("function1" instead of "transform1") for function creation nodes

Intent

These changes improve code maintainability by centralizing default name definitions and create a flexible extension pattern. Subclasses can now easily override the default function name without relying on string literals scattered throughout the codebase. This addresses the inconsistency in default naming for function creation nodes and aligns with the intended behavior referenced in issue #2515.

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