### 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)

radius_secret: str | None = None,
        radius_port: int | None = None,
        **kwargs,
    ):
        super().__init__()
        if kv_engine_version and kv_engine_version not in VALID_KV_VERSIONS:
            raise VaultError(
                f"The version is not supported: {kv_engine_version}. "
                f"It should be one of {VALID_KV_VERSIONS}"
            )
        if auth_type not in VALID_AUTH_TYPES:
            raise VaultError(
                f"The auth_type is not supported: {auth_type}. It should be one of {VALID_AUTH_TYPES}"
            )
        if auth_type == "token" and not token and not token_path:
            raise VaultError("The 'token' authentication type requires 'token' or 'token_path'")
        if auth_type == "github" and not token and not token_path:
            raise VaultError("The 'github' authentication type requires 'token' or 'token_path'")
        if auth_type == "approle" and not role_id:
            raise VaultError("The 'approle' authentication type requires 'role_id'")
        if auth_type == "kubernetes":
            if not kubernetes_role:
                raise VaultError("The 'kubernetes' authentication type requires 'kubernetes_role'")
            if not kubernetes_jwt_path:
                raise VaultError("The 'kubernetes' authentication type requires 'kubernetes_jwt_path'")
        if auth_type == "azure":
            if not azure_resource:
                raise VaultError("The 'azure' authentication type requires 'azure_resource'")
            if not azure_tenant_id:
                raise VaultError("The 'azure' authentication type requires 'azure_tenant_id'")