### Apache Airflow version

2.5.0

### What happened

In [Airflow 2.4.0](https://github.com/apache/airflow/blob/main/RELEASE_NOTES.rst#airflow-240-2022-09-19), a new feature was added that added an option to mask sensitive data in UI configuration page ([PR](https://github.com/apache/airflow/pull/25346)). I have set `AIRFLOW__WEBSERVER__EXPOSE_CONFIG` as `NON-SENSITIVE-ONLY`.

The feature is working partially as the `airflow.cfg` file display only has [sensitive configurations](https://github.com/apache/airflow/blob/2.5.0/airflow/configuration.py#L149-L160) marked as `< hidden >`. However, the `Running Configuration` table below the file display has all configuration set via environment variables marked as `< hidden >` which I believe is unintended.

I did not change `airflow.cfg` so the value here is displaying the default value of `False` as expected.

![Screen Shot 2023-01-05 at 1 39 11 PM](https://user-images.githubusercontent.com/5952735/210891805-1a5f6a6b-1afe-4d05-b03d-61ac583441fc.png)

The value for `expose_config` I expect to be shown as `NON-SENSITIVE-ONLY` but it shown as `< hidden >`.

![Screen Shot 2023-01-05 at 1 39 27 PM](https://user-images.githubusercontent.com/5952735/210891803-dba826d4-2d3c-4781-aeae-43c46e31fa89.png)


### What you think should happen instead

As mentioned previously, the value for `expose_config` I expect to be shown as `NON-SENSITIVE-ONLY`.

Only the [sensitive variables](https://github.com/apache/airflow/blob/2.5.0/airflow/configuration.py#L149-L160) should be set as `< hidden >`.

### How to reproduce

Set an Airflow configuration through the environment variable and check on the Configuration page.

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

self, config_sources: ConfigSourcesType, section: str, key: str
    ) -> str | None:
        fallback_key = key + "_secret"
        if (section, key) in self.sensitive_config_values:
            section_dict = config_sources.get(section)
            if section_dict is not None:
                secrets_path_value = section_dict.get(fallback_key)
                if secrets_path_value is not None:
                    if isinstance(secrets_path_value, str):
                        secrets_path = secrets_path_value
                    else:
                        secrets_path = secrets_path_value[0]
                    return _get_config_value_from_secret_backend(secrets_path)
        return None
    def get_mandatory_value(self, section: str, key: str, **kwargs) -> str:
        value = self.get(section, key, _extra_stacklevel=1, **kwargs)
        if value is None:
            raise ValueError(f"The value {section}/{key} should be set!")
        return value
    @overload  
    def get(self, section: str, key: str, fallback: str = ..., **kwargs) -> str:  
        ...
    @overload  
    def get(self, section: str, key: str, **kwargs) -> str | None: