gnomeExtensions/update: Make collision calculation independent of fetching

Do not collect pname → uuid mapping during extension processing.
We will want to do it separately so that we can do it after changing
the set of merged versions without having to re-fetch everything.

Also remove the collision warning. It would only have warned about pname
collisions within a each `gnomeXYExtensions` attribute set but those
sets do not expose extensions by name, so the warning was pointless.

Since we are now iterating on `extensions.json`, we had to transpose the iterations.

0 files changed, 0 insertions, 0 deletions