Fix var type resolution in diagram generator

[pasindufernando1]

Purpose

This PR addresses fixing the diagram generator resolving var type declarations to their inferred types (e.g., string) instead of preserving the var keyword. The FormBuilder.dataVariable() method now checks for VAR_TYPE_DESC syntax kind before falling back to semantic type resolution.

Fixes : wso2/product-ballerina-integrator#1674

[Copilot]

Pull request overview

This PR fixes a bug in the diagram generator where variable declarations using the var keyword were being resolved to their inferred types (e.g., string, int, json) instead of preserving the var keyword as written in the source code. The fix adds a check for the VAR_TYPE_DESC syntax kind in the FormBuilder.dataVariable() method before falling back to semantic type resolution.

Changes:

• Modified FormBuilder.dataVariable() to check for VAR_TYPE_DESC syntax kind and preserve "var" keyword
• Added new test case (variable9.json) with corresponding source file (variable.bal)
• Updated 20 existing test configuration files to expect "var" instead of resolved types

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
FormBuilder.java	Added VAR_TYPE_DESC check in dataVariable() method to preserve "var" keyword instead of resolving to inferred type
variable.bal	New test source file with simple function containing var declaration
variable9.json	New test configuration for the variable.bal test case
variable1.json	Updated expected type values from resolved types ("int") to "var" for var declarations
xml_payload.json	Updated expected type value from "xml:Element" to "var"
binary_data.json	Updated expected type value from "byte[3]" to "var"
flags1.json	Updated expected type values from "boolean" to "var"
comment9.json, comment10.json	Updated expected type values from "()" and "int" to "var"
foreach1.json, foreach2.json	Updated expected type values from "int" to "var"
match8.json	Updated expected type value from "int" to "var"
resource_action_call-http-get1.json	Updated expected type value from "json" to "var"
resource_action_call-http-post1.json	Updated expected type value from "json" to "var"
remote_action_call-http-get2.json	Updated expected type value from "json" to "var"
remote_action_call-http-post2.json	Updated expected type value from "json" to "var"
transaction1.json through transaction6.json	Updated expected type values from "()" to "var"

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