Account deactivation tests depend on oneshot UIA

[timedoutuk]

Related: #893

complement/tests/csapi/account_deactivate_test.go

Lines 110 to 121 in 1a2baac

	func deactivateAccount(t *testing.T, authedClient *client.CSAPI, password string) *http.Response {
	t.Helper()
	reqBody := client.WithJSONBody(t, map[string]interface{}{
	"auth": map[string]interface{}{
	"type": "m.login.password",
	"identifier": map[string]interface{}{
	"type": "m.id.user",
	"user": authedClient.UserID,
	},
	"password": password,
	},
	})

The account deactivation helper requires being capable of skipping UIA, which is not spec compliant and causes flaky failures in all tests that use it.