[Servicing Hotfix] Enable VS 17.14 to use online templates

[Copilot]

This PR enables Visual Studio 17.14 to access online templates by updating the template configuration in the release/VS1714P7 branch.

Problem

VS 17.14 was restricted to using local templates only because the useLocalTemplate flag was set to true in the template configuration. This prevented users from accessing the latest online templates from the Microsoft 365 Agents Toolkit repository.

Solution

Changed useLocalTemplate from true to false in packages/fx-core/src/common/templates-config.json. This single configuration change enables VS 17.14 to:

• Fetch templates from the online Microsoft 365 Agents Toolkit repository
• Access the latest template versions and updates
• Use VS-specific template configurations (vstagPrefix: "templates-vs@", vsversion: "18.0.0")
• Download templates from the correct URLs pointing to microsoft-365-agents-toolkit instead of the legacy TeamsFx repository

Changes Made

• File: packages/fx-core/src/common/templates-config.json
• Change: "useLocalTemplate": true → "useLocalTemplate": false

This is a minimal, surgical change that directly addresses the issue title "let VS 17.14 can use online templates" without affecting any other functionality.

Fixes #14405.

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