🐛 Problem

When cost management tag inheritance is enabled, billed resources inherit tags from resource groups and/or subscriptions in a case sensitive manner. For example, tag 'App' in the resource is different from tag 'app' in the resource group. Billing events for that resource thus include both tags name/value pairs.

The Recommend-StorageAccountOptimizationsToBlobStorage runbook does a JSON conversion (ConvertFrom-Json, in PS 5.1) of the tags property generated by the recommendations results, which throws an error, because of duplicate keys (PS is case-insensitive).

👣 Repro steps

1. Enable Cost Management tag inheritance
2. Add a storage account tag, e.g., 'environment'='prd'
3. Add to the storage account's resource group a similar tag in uppercase, e.g., 'ENVIRONMENT'='prd'
4. Create the conditions for the generation of a cost recommendation for that storage account, for example, letting it grow in size for several weeks in a row
5. See Recommend-StorageAccountOptimizationsToBlobStorage runbook throwing exception.

🤔 Expected

The Recommend-StorageAccountOptimizationsToBlobStorage should deal with tag duplicates before trying to convert it to JSON in PowerShell.

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