fix: provide default MCP auto-approve configuration

[xinyi-gong]

Summary

Fixes the following CLS warning emitted during Eclipse startup:

[McpAutoApproveService] Invalid McpAutoApproveService config, resetting to empty undefined

Root Cause

Eclipse did not include github.copilot.agent.tools.mcp.autoApprove in the configuration sent to CLS. CLS therefore received undefined and treated it as an invalid MCP auto-approve configuration.

Changes

• Add MCP settings to CopilotAgentSettings.ToolsSettings.
• Initialize mcp.autoApprove to an empty list.
• Ensure Eclipse sends mcp.autoApprove: [] to CLS.
• Add a regression test covering the serialized configuration.

This does not change approval behavior because Eclipse continues to handle confirmations through editorHandlesAllConfirmation.

Fixes #358

[Copilot]

Pull request overview

This PR ensures the Eclipse client always sends an explicit MCP auto-approve configuration (mcp.autoApprove: []) to the Copilot language server, preventing CLS from receiving undefined and logging the startup warning reported in #358.

Changes:

• Extend CopilotAgentSettings.ToolsSettings with MCP settings and default autoApprove to an empty list.
• Ensure serialized settings include github.copilot.agent.tools.mcp.autoApprove as an empty array.
• Add a regression test that asserts the serialized configuration contains the empty autoApprove list.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
com.microsoft.copilot.eclipse.ui.test/src/com/microsoft/copilot/eclipse/ui/preferences/LanguageServerSettingManagerTests.java	Adds a regression test asserting mcp.autoApprove is serialized as an empty list.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/protocol/CopilotAgentSettings.java	Introduces MCP tool settings (tools.mcp.autoApprove) with a default empty list and integrates it into equality/hash/toString.