Route appmod prompt to local agent provider

[haoozhang]

What does this implement/fix? Explain your changes.

This pull request updates the Java Upgrade notification service to ensure that Java upgrade prompts are always routed to the local Copilot agent, improving reliability and compatibility with custom agents. The main changes involve adding a new helper method and integrating it into the query builder logic using reflection for backward compatibility.

Copilot Agent Routing Improvements:

• Added a new method withLocalAgentProvider that pins queries to the local Copilot agent provider using reflection, ensuring the Java Upgrade prompt uses the correct agent. This method gracefully handles older Copilot plugin versions by silently skipping if the required API is unavailable.
• Integrated the withLocalAgentProvider method into the Copilot query builder flow, so all Java upgrade prompts are explicitly routed to the local agent.

Minor cleanup:

• Removed an unused import of AzureTelemeter from JavaVersionNotificationService.java.

Does this close any currently open issues?

Any relevant logs, screenshots, error output, etc.?

Any other comments?

…

Has this been tested?

• Tested

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