What measures has she taken to intervene in the Nelson Mandela Bay Metropolitan Municipality under section 139(7) of the Constitution of the Republic of South Africa 1996, and/or any other empowering provision in respect of the (a) prolonged suspension of the municipal manager since September 2018, (b) failure of the municipal council to elect an executive mayor since December 2019 and (c) purported appointment of and/or assumption of office by a councillor in the position of an acting executive mayor?