Use reregisterurl to move datalad remotes to web

[jwodder]

Closes #35.

Currently blocked by dandi/dandi-archive#1943.

• TODO: Write a one-shot script for backfilling reregisterurl invocations for previously-embargoed Dandisets (Use reregisterurl to move datalad remotes to web #36 (comment))

[jwodder]

Now blocked by the fact that this requires git-annex 10.20240430 but neurodebian still only has 10.20240227.

CC @yarikoptic

[jwodder]

Correction: While the outdated git-annex is a problem, the current test failures are actually due to dandi/dandi-archive#1943.

[yarikoptic]

on neurodebian and drogon we have now 10.20240430-1~ndall+1 but within dandisets-2 conda env we are using conda installed git-annex and there we have not seen updates for quite a while :-/ need to see if I could figure it out conda-forge/git-annex-feedstock#160 . any ideas/help is most welcome!

[yarikoptic]

I removed git and git-annex packages in that conda env (dandisets-2) so we should be ready to merge/deploy this to prevent datasets failing their updates.

Note that it seems that subsequent update on the failed dataset just proceeds forward, so we might need to get back to those which once were private and migrate "retroactively" -- please add some support command or script for doing that.

[jwodder]

@yarikoptic This can't be merged, as the tests are still failing due to dandi/dandi-archive#1943.