Remove support of clientType in rond input

[davidebianchi]

Is your feature request related to a problem? Please describe

In the rond input it is set the ClientType, which is passed as params to create a new input:

rond/sdk/rondinput/http/input.go

Lines 47 to 71 in d8c2c8b

	// TODO: before to have a stable interface, remove the usage of clientTypeHeaderKey.
	// We could add to the core.Input a map[string]any to add any data passed from
	// outside instead
	func NewInput(req *http.Request, clientTypeHeaderKey string, pathParams map[string]string, user core.InputUser, responseBody any) (core.Input, error) {
	requestBody, err := parseRequestBody(req)
	if err != nil {
	return core.Input{}, err
	}
	return core.Input{
	ClientType: req.Header.Get(clientTypeHeaderKey),
	Request: core.InputRequest{
	Method: req.Method,
	Path: req.URL.Path,
	Headers: req.Header,
	Query: req.URL.Query(),
	PathParams: pathParams,
	Body: requestBody,
	},
	Response: core.InputResponse{
	Body: responseBody,
	},
	User: user,
	}, nil
	}

It should be removed since it is the support to a Mia-Platform specific header, and instead use it inside some custom metadata #245.