Add comprehensive troubleshooting documentation for environment inventory issues

[Copilot]

Users frequently encounter environments not appearing in the Power Platform Admin App due to inventory configuration settings. This PR adds structured troubleshooting documentation to enable self-service resolution.

Documentation Added

Quick diagnostics (environment-inventory-quick-reference.md)

• Decision tree for root cause identification
• 5 common fixes with time estimates
• Diagnostic checklist covering sync flows, field settings, licenses, and permissions

Detailed troubleshooting (environments-not-listed.md)

• Step-by-step resolution procedures
• Explanation of "Excuse From Inventory" field behavior
• "Track All Environments" environment variable configuration
• Pagination and permission verification steps

Support templates (RESPONSE_TEMPLATES.md)

• Standardized responses for maintainers
• Scenario-specific follow-ups (license, permissions, first-time setup)
• Escalation criteria

Issue response template (ISSUE_RESPONSE_environments-not-listed.md)

• Ready-to-use response with common solutions
• Information gathering checklist for follow-ups

Root Causes Documented

1. "Excuse From Inventory" = Yes (most common) - environment explicitly excluded
2. Sync flow not executing - Admin Sync Template v4 Driver flow errors or hasn't run
3. Track All Environments = False - new environments default to excluded
4. License pagination limits - trial licenses hit 100-item API limits
5. Insufficient permissions - service account lacks Power Platform Administrator role

Repository Changes

• Created docs/troubleshooting/ directory with organized guides
• Updated main README with troubleshooting section linking to new documentation
• Documentation structure enables easy expansion for future common issues

Original prompt

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This section details on the original issue you should resolve

<issue_title>Some Environments are not listed in the Power Platform Admin App</issue_title>
<issue_description>Hello Team,

I am facing issue with COE Toolkit configuration. Some of the environments are not listing in Power Platform Admin App.Can you please help me to get it done.

Thanks
Sunil</issue_description>

<agent_instructions>Analyze the issue and troubleshoot with solution</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Custom agent used: CoE Custom Agent
Specialized agent for triaging and fixing issues in the CoE Starter Kit. Always consult the official CoE docs and the team’s SharePoint notes first, then mine prior GitHub issues and the CoE Common Responses playbook.

• Fixes Some Environments are not listed in the Power Platform Admin App #10598

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