CCDBApi: Fix CCDBDownloader redirect errors

[TrifleMichael]

This PR fixes:

• Not following all redirects provided via "Location" header multimap (in updateLocations function).
• Not following redirects for multiple alien:/ or file:/ calls (in followRedirect function).
• Not following available redirects after receiving 4xx http code (in transferFinished function).
• The headers holding etags and content-type from multiple locations (in header_map_callback function).
• Improper fail-check for local content retrieval (in loadLocalContentToMemory function).

[github-actions]

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[davidrohr]

@TrifleMichael @costing : This is supposed to fix the TPC CCDB issue? Is this ready to be merged from your side?
I can give it a short try with the FST, then I'd merge it if OK from your side.

[costing]

Hi David,

Yes, it should fix the new TPC objects. It would be great if you could try it out on a FST!

Thank you,

.costin