az interactive command is not working

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

## Describe the bug

**Command Name**
`az interactive`

**Errors:**
```
cannot import name 'ENV_ADDITIONAL_USER_AGENT' from 'azure.cli.core.commands.client_factory' (/usr/local/Cellar/azure-cli/2.7.0/libexec/lib/python3.8/site-packages/azure/cli/core/commands/client_factory.py)
Traceback (most recent call last):
python3.8/site-packages/knack/cli.py, ln 215, in invoke
cmd_result = self.invocation.execute(args)
cli/core/commands/__init__.py, ln 654, in execute
raise ex
...
interactive/azext_interactive/azclishell/app.py, ln 31, in
from azure.cli.core.commands.client_factory import ENV_ADDITIONAL_USER_AGENT
ImportError: cannot import name 'ENV_ADDITIONAL_USER_AGENT' from 'azure.cli.core.commands.client_factory' (/usr/local/Cellar/azure-cli/2.7.0/libexec/lib/python3.8/site-packages/azure/cli/core/commands/client_factory.py)
```

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- _Put any pre-requisite steps here..._
- `az interactive`

## Expected Behavior

## Environment Summary
```
macOS-10.15.4-x86_64-i386-64bit
Python 3.8.3
Installer: HOMEBREW

azure-cli 2.7.0

Extensions:
azure-devops 0.17.0
interactive 0.4.3

```
## Additional Context