Using lbap bot to dump opendata info summary in file

As suggested, a feedback system for test results already exist in the form of the lbap_bot. For Opendata requests, we would like to extend this system to also show the requested branches as well as the estimated output size of the full production.

While security concerns prevents us from sharing the MR with the Opendata user, we (at least for now) compromise to dump the output of the bot in a file which will then be deployed to eospublic. This is done by calling xrdcp in the script using the lbci account.

Keep in mind that the changes only intend to affect merge requests from the lbodreq Opendata service account. However, from experience with AnaProds, it would be nice to have a list of branches for a quick check. If wanted, this could of course also be implemented for all productions.