Handle entire expression deletion in select and root expressions

[pasindufernando1]

Purpose

Addresses : wso2/product-ballerina-integrator#1069

[Copilot]

Pull Request Overview

This PR enhances the data mapping deletion functionality by handling entire expression deletion in select and root expressions, addressing issue #1069 in the Ballerina integrator.

• Adds support for deleting entire expressions in function bodies and select clauses
• Implements proper default value replacement when expressions are deleted
• Expands test coverage with new test cases for various deletion scenarios

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
variable6.bal	Test source file with function definition and query expression structures
variable8.json	Test configuration for function expression deletion scenario
variable9.json	Test configuration for query select clause deletion scenario
DataMappingDeleteTest.java	Adds new test cases to cover expression deletion scenarios
DataMapManager.java	Core logic enhancement to handle expression deletion in function bodies and select clauses

Comments suppressed due to low confidence (1)

flow-model-generator/modules/flow-model-generator-core/src/main/java/io/ballerina/flowmodelgenerator/core/DataMapManager.java:1

• The variable functionTypeSymbol is assigned but never used. You can directly chain the method call: Optional<TypeSymbol> returnType = functionSymbol.typeDescriptor().returnTypeDescriptor();

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