### Description

Support mounting to multiple namespaces with the Hashicorp Vault Secrets Back-end

### Use case/motivation

As a data engineer I wish to utilize secrets stored in multiple mount paths (to support connecting to multiple namespaces)  without having to mount to a higher up namespace.

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] 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)

"""
        Get secret value from the KV engine.
        :param secret_path: The path of the secret.
        :param secret_version: Specifies the version of Secret to return. If not set, the latest
            version is returned. (Can only be used in case of version 2 of KV).
        See https://hvac.readthedocs.io/en/stable/usage/secrets_engines/kv_v1.html
        and https://hvac.readthedocs.io/en/stable/usage/secrets_engines/kv_v2.html for details.
        :return: secret stored in the vault as a dictionary
        """
        try:
            if self.kv_engine_version == 1:
                if secret_version:
                    raise VaultError("Secret version can only be used with version 2 of the KV engine")
                response = self.client.secrets.kv.v1.read_secret(
                    path=secret_path, mount_point=self.mount_point
                )
            else:
                response = self.client.secrets.kv.v2.read_secret_version(
                    path=secret_path, mount_point=self.mount_point, version=secret_version
                )
        except InvalidPath:
            self.log.debug("Secret not found %s with mount point %s", secret_path, self.mount_point)
            return None
        return_data = response["data"] if self.kv_engine_version == 1 else response["data"]["data"]
        return return_data
    def get_secret_metadata(self, secret_path: str) -> dict | None: