Activate XML extension recommendation for POM editing

[Copilot]

Users expect automation when editing POM.xml files. The extension pack had a dormant XML recommendation module that was never wired up.

Changes

• Activated XML recommendation: Imported and initialized the existing xml.ts module in recommendation/index.ts
• Enhanced message: Updated recommendation text to highlight schema validation, auto-completion, and formatting capabilities

Implementation

// src/recommendation/index.ts
import { initialize as initXmlRecommendation } from "./xml";

export function initialize(_context: vscode.ExtensionContext) {
  initHandler();
  initXmlRecommendation(_context);  // Now activated
}

When users open pom.xml files, they receive a one-time prompt to install RedHat's XML extension (if not already installed), which provides Maven schema validation, element/attribute completion, and formatting alongside the existing Maven extension's dependency auto-completion.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Brainstorm how we can provide better UX when editing POM (XML integration)</issue_title>
<issue_description>Per user feedback, user expect more automation when editing POM.xml</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Brainstorm how we can provide better UX when editing POM (XML integration) #914

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