Restore 4.1.0 snapshots once cleanup has completed on 4.0.x

[snicoll]

main currently has a number of changes that are not tracked properly with the current 4.1.0 milestone being empty. While we work on these changes, we'd like to backup the current main to review-4.1.x and force push main to the state of 4.0.x.

Once the migration completes, we'll branch 4.0.x again and then review and apply the changes in review-4.1.x accordingly.

This impacts the following issues:

• Enable sign with cert chain and configuration of subjectDnConstraints #1419
• Upgrade to Apache WSS4J 3.0.3 #1429
• Update HttpComponents5ClientFactory to use setConnectionTimeout #1437
• 0bd5441 (can be applied to 4.0.x)
• d4b489a (can be applied to 4.0.x)
• Add Observation implementation #1438
• 3214e8c (can be applied to 4.0.x)