Refactor logic in generation text edits for array element deletion

[pasindufernando1]

Purpose

Addresses : wso2/product-ballerina-integrator#1170

[Copilot]

Pull Request Overview

This PR refactors the logic for generating text edits when deleting array elements from mappings. The main purpose is to fix incorrect positioning when determining the text range to delete for array elements that are not at the beginning or end of the array.

• Fixed incorrect start position calculation for deleting middle and last array elements
• Added comprehensive test cases to validate array element deletion scenarios

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
DataMapManager.java	Fixed text edit range calculation by using endLine() instead of startLine() for previous element positioning
variable5.bal	Added test source file with array type definitions and initialization
variable6.json	Added test configuration for deleting middle array element (index 1)
variable7.json	Added test configuration for deleting last array element (index 2)
DataMappingDeleteTest.java	Added new test cases to the configuration list

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}