Add Flow Action Consumption Optimization Guide for large-scale tenants (#10864)

* Initial plan

* Add Flow Action Consumption Optimization Guide for large-scale CoE tenants

Co-authored-by: mohamrizwa <220306360+mohamrizwa@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mohamrizwa <220306360+mohamrizwa@users.noreply.github.com>

Author: Copilot

CenterofExcellenceCoreComponents/README.md

@@ -129,6 +129,9 @@ Key environment variables that control inventory behavior:
 - `admin_FullInventory` - Run full inventory (Yes/No, default: No)
 - `admin_InventoryFilter_DaysToLookBack` - Days to look back for modified resources (default: 7)
 - `admin_DelayObjectInventory` - Add random delay to avoid throttling (Yes/No, default: No)
+- `admin_isFullTenantInventory` - Track all environments or a subset (Yes/No, default: Yes)
+
+For detailed guidance on reducing action consumption and optimizing flow performance in large tenants, see the **[Flow Action Consumption Optimization Guide](../CenterofExcellenceResources/FlowActionConsumptionOptimization.md)**.
 
 ## Additional Documentation