Use request.CTX instead of *request.Context (#24877)

* Use request.CTX instead of *request.Context

* Fix tests

server/channels/app/slashcommands/command_shrug.go

@@ -35,7 +35,7 @@ func (*ShrugProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Comman
 	}
 }
 
-func (*ShrugProvider) DoCommand(a *app.App, c *request.Context, args *model.CommandArgs, message string) *model.CommandResponse {
+func (*ShrugProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
 	rmsg := `¯\\\_(ツ)\_/¯`
 	if message != "" {
 		rmsg = message + " " + rmsg