Fix the concurrent issue in the publish artifacts API

[nipunayf]

Purpose

The artifacts() method was throwing an ArrayIndexOutOfBoundsException during the sorting operation due to a concurrency issue in the sorting process.

Addresses wso2/product-ballerina-integrator#1178

[Copilot]

Pull Request Overview

This PR fixes a concurrency issue in the publish artifacts API where the artifacts() method was throwing an ArrayIndexOutOfBoundsException during sorting operations. The fix replaces HashMap with TreeMap for automatic sorting and removes the manual sorting logic that was causing thread safety issues.

• Replaces HashMap with TreeMap for automatic sorting to eliminate concurrent modification issues
• Removes the post-processing sorting loop that was vulnerable to race conditions
• Adds TreeMap import to support the new implementation

Comments suppressed due to low confidence (1)

architecture-model-generator/modules/architecture-model-generator-core/src/main/java/io/ballerina/artifactsgenerator/ArtifactsGenerator.java:1

• The LinkedHashMap import is no longer used after removing the manual sorting logic and should be removed to clean up unused imports.

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[dan-niles]

LGTM