az devops service-endpoint azurerm create is not working properly

### **This is autogenerated. Please review and update as needed.**

## Describe the bug

**Command Name**
`az devops service-endpoint azurerm create
Extension Name: azure-devops. Version: 0.20.0.`

**Errors:**
```
The command failed with an unexpected error. Here is the traceback:
Please specify azure service principal key in AZURE_DEVOPS_EXT_AZURE_RM_SERVICE_PRINCIPAL_KEY environment variable in non-interactive mode or use --azure-rm-service-principal-certificate-path.
Traceback (most recent call last):
File "C:\Users\MichaelStibenParedes\.azure\cliextensions\azure-devops\azext_devops\dev\common\prompting.py", line 92, in verify_is_a_tty_or_raise_error
verify_is_a_tty()
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/prompting.py", line 28, in verify_is_a_tty
knack.prompting.NoTTYException

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 231, in invoke
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 657, in execute
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 720, in _run_jobs_serially
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 712, in _run_job
File "C:\Users\MichaelStibenParedes\.azure\cliextensions\azure-devops\azext_devops\dev\common\exception_handler.py", line 31, in azure_devops_exception_handler
reraise(*sys.exc_info())
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\six.py", line 703, in reraise
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 691, in _run_job
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 328, in __call__
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/command_operation.py", line 121, in handler
File "C:\Users\MichaelStibenParedes\.azure\cliextensions\azure-devops\azext_devops\dev\team\service_endpoint.py", line 127, in create_azurerm_service_endpoint
verify_is_a_tty_or_raise_error(error_message)
File "C:\Users\MichaelStibenParedes\.azure\cliextensions\azure-devops\azext_devops\dev\common\prompting.py", line 94, in verify_is_a_tty_or_raise_error
raise NoTTYException(error_msg)
knack.prompting.NoTTYException: Please specify azure service principal key in AZURE_DEVOPS_EXT_AZURE_RM_SERVICE_PRINCIPAL_KEY environment variable in non-interactive mode or use --azure-rm-service-principal-certificate-path.

```

## To Reproduce:
Create the Service principaland obtain the password and save it in the env var AZURE_DEVOPS_EXT_AZURE_RM_SERVICE_PRINCIPAL_KEY

- _Put any pre-requisite steps here..._
- `az devops service-endpoint azurerm create --name {} --azure-rm-service-principal-id {} --azure-rm-subscription-id {} --azure-rm-subscription-name {} --azure-rm-tenant-id {} --output {}`

## Expected Behavior

The services connectionis created correctly

## Environment Summary
```
Windows-10-10.0.19041-SP0
Python 3.8.9
Installer:

azure-cli 2.28.0

Extensions:
application-insights 0.1.14
azure-devops 0.20.0

```
## Additional Context

The Enviromental variable AZURE_DEVOPS_EXT_AZURE_RM_SERVICE_PRINCIPAL_KEY has already created
Look and the end of this SC the env variable created