Add Env Setup to Copilot Instructions

[JennyPng]

Azure/azure-sdk-tools#12592

• Adding instructions on using new Verify Setup MCP tool, which checks that requirements are installed in the environment
• We want this check to be proactive and happen without explicit invokation. However, currently, Copilot would only remember if the tool is run in the current session, not in newer sessions, so the user would likely run verify setup in each new session due to a lack of a caching. This will be accepted for Scenario 1 and improved in future iterations

[github-actions]

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