Ask forge admins about all issues with archiving their forges

There could be non-technical issues with forge archiving, for example some admins have responded saying they need to obtain export approval.

Fixes: commit 16ba15e5

Jenkins job DWAPPS/gitlab-builds #367 succeeded .
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added 7 commits

• 8f4013b0...579c93f7 - 6 commits from branch swh/devel:master
• 2bc3285d - Ask forge admins about all issues with archiving their forges

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merged

Jenkins job DWAPPS/gitlab-builds #368 failed .
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