Migrate LM tools over to MCP

[MicroFish91]

Converting to MCP so our tools can be accessed via Copilot CLI.

Built leveraging Brandon's MCP work / package.

The activity log tool's core logic hasn't changed much, just re-wrapped to be contributed as an MCP tool.

[Copilot]

Pull request overview

This PR migrates the extension’s Copilot/agent tooling from VS Code “LM tools” contribution points to an in-proc MCP server, and rewires the existing Azure Activity Log tool to be exposed via MCP (with associated telemetry updates).

Changes:

• Replaced LM-tool registration/contribution (languageModelTools) with an MCP server definition + in-proc MCP tool registration.
• Ported “Get Azure Activity Log” from an AzExtLMTool implementation to an MCP CopilotTool, including updated selection/telemetry handling.
• Introduced shared constants (extension id + MCP server id/label) and a small Lazy<T> helper for version retrieval.

Reviewed changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/utils/lazy.ts	Adds a Lazy<T> helper used to lazily compute extension version.
src/extensionVariables.ts	Adds a lazily-computed ext.version and related imports.
src/extension.ts	Registers the MCP HTTP provider and tool registration; uses centralized extension id constant.
src/constants.ts	Adds centralized extension id and MCP server id/label constants.
src/chat/tools/registerLMTools.ts	Removes LM tool registration entry point.
src/chat/tools/registerAzExtTools.ts	Adds MCP tool registration entry point.
src/chat/tools/GetAzureActivityLog/GetAzureActivityLog.ts	Removes the LM-tool implementation of “Get Azure Activity Log”.
src/chat/tools/azureActivityLog/getAzureActivityLog/logTelemetry.ts	Adds telemetry helpers for activity log tool execution.
src/chat/tools/azureActivityLog/getAzureActivityLog/GetAzureActivityLogContext.ts	Fixes relative import path for ActivitySelectedCache after file moves.
src/chat/tools/azureActivityLog/getAzureActivityLog/getAzureActivityLog.ts	Adds MCP tool implementation for “Get Azure Activity Log”.
src/chat/tools/azureActivityLog/getAzureActivityLog/convertActivityTree.ts	Updates imports to match new folder structure.
src/chat/askAgentAboutActivityLog/askAgentAboutActivityLog.ts	Avoids opening agent chat when no activity items are selected.
package.nls.json	Adds localized label string for MCP server definition provider.
package.json	Removes languageModelTools, adds mcpServerDefinitionProviders, and adds new dependencies.
package-lock.json	Updates lockfile for new MCP/zod (and transitive) dependencies.

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