[MM-34838] Remove Ancillary Permissions That Are Purposefully Being Removed (#17466)

* remove ancillary permissions

* Start writing tests

* Move Ancillary Permissions to FrontEnd

* remove function

* remove test

* clean up

* fix comment

* Update api4/permission.go

Co-authored-by: Martin Kraft <martinkraft@gmail.com>

* Update api4/permission.go

* Update api4/permission.go

* license info

* Add Tests

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Martin Kraft <martinkraft@gmail.com>

model/client4.go

@@ -573,6 +573,10 @@ func (c *Client4) GetSharedChannelsRoute() string {
 	return "/sharedchannels"
 }
 
+func (c *Client4) GetPermissionsRoute() string {
+	return "/permissions"
+}
+
 func (c *Client4) DoApiGet(url string, etag string) (*http.Response, *AppError) {
 	return c.DoApiRequest(http.MethodGet, c.ApiUrl+url, "", etag)
 }
@@ -6312,3 +6316,16 @@ func (c *Client4) GetRemoteClusterInfo(remoteID string) (RemoteClusterInfo, *Res
 
 	return rci, BuildResponse(r)
 }
+
+func (c *Client4) GetAncillaryPermissions(subsectionPermissions []string) ([]string, *Response) {
+	var returnedPermissions []string
+	url := fmt.Sprintf("%s/ancillary?subsection_permissions=%s", c.GetPermissionsRoute(), strings.Join(subsectionPermissions, ","))
+	r, appErr := c.DoApiGet(url, "")
+	if appErr != nil {
+		return returnedPermissions, BuildErrorResponse(r, appErr)
+	}
+	defer closeBody(r)
+
+	json.NewDecoder(r.Body).Decode(&returnedPermissions)
+	return returnedPermissions, BuildResponse(r)
+}