{testsdk} No YAML recording file is generated if there is no record-able requests

Tests such as `test_create_account_sas` don't contain record-able requests:

https://github.com/Azure/azure-cli/blob/30216d0268f3491b8af2aa060d90a9e1f94f9b3c/src/azure-cli/azure/cli/command_modules/storage/tests/latest/test_storage_account_scenarios.py#L779-L797

`ResourceGroupPreparer`, `StorageAccountPreparer`'s requests won't be recorded. In such case, running this test in live mode will delete the current (handmade) YAML and not generate a new YAML.

If this test is then run in playback mode, test framework detects **there is no YAML recording file** and will **automatically go to live mode** and cause failure in CI (https://github.com/Azure/azure-cli/pull/21403):

https://dev.azure.com/azure-sdk/public/_build/results?buildId=1388110&view=logs&jobId=4d9a7583-3a39-5165-718c-04fb813e465f&j=4d9a7583-3a39-5165-718c-04fb813e465f&t=6c30694c-16d1-5996-0668-2b6e3a9f9dd5

```
E ValueError: Unable to get authority configuration for https://login.microsoftonline.com/00000000-0000-0000-0000-000000000000. Authority would typically be in a format of https://login.microsoftonline.com/your_tenant_name

env/lib/python3.10/site-packages/msal/authority.py:87: ValueError
- generated xml file: /home/vsts/.azdev/env_config/home/vsts/work/1/s/env/test_results.xml -
=========================== short test summary info ============================
FAILED src/azure-cli/azure/cli/command_modules/storage/tests/latest/test_storage_account_scenarios.py::StorageAccountTests::test_create_account_sas
```

It is the design of `vcrpy` that **no YAML recording file is generated if there is no record-able requests**. `vcrpy` does have an option to force to create the YAML:

https://github.com/kevin1024/vcrpy/blob/c79a06f639dd628536c9868044e78df1012985f9/vcr/cassette.py#L329-L332

```py
def _save(self, force=False):
if force or self.dirty:
self._persister.save_cassette(self._path, self._as_dict(), serializer=self._serializer)
self.dirty = False

```

When `force` is `True`, this will create a YAML with empty `interactions`:

```yaml
interactions: []
version: 1
```

But this `force` parameter is not surfaced as a public API.