az storage account check-name --name not setting exit code for existing

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**Describe the bug**
Running `az storage account check-name --name` does not set an error if the storage account name already exists.

**To Reproduce**
1) Create a storage account
2) check if it exists:
`az storage account check-name --name existing`
3) Check the exit code
`$LASTEXITCODE`

**Expected behavior**
Since the storage account names have to be different, it should switch the exit code to 1, instead of 0.

**Environment summary**
`PS C:\Users\tayven.bigelow> $PSVersionTable
PSVersion 7.1.3
PSEdition Core`

`PS C:\Users\tayven.bigelow> az --version
azure-cli 2.27.2
core 2.27.2
telemetry 1.0.6
Extensions:
account 0.2.1
Python location 'C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\python.exe'
Extensions directory 'C:\Users\tayven.bigelow\.azure\cliextensions'
Python (Windows) 3.8.9 (tags/v3.8.9:a743f81, Apr 6 2021, 13:22:56) [MSC v.1928 32 bit (Intel)]`

**Additional context**