Part of #12160

Given that we have access to agent logs in coder support bundles, we can now scan the agent logs for potential issues.

Potential strings to scan for and alert on:

• "disconnected from coderd"
• "failed to connect to the coordinate endpoint"
• "failed to close remote coordination"
• "recv DERPmap error"
• "speedtest listener failed"
• "update tailnet addresses"
• "create tailnet"

NOTE: The above is a sample list; there may be more definitely interesting strings or patterns.