Similar to #6210.

Shard key mappings were not applied properly in some places when using a consensus snapshot. This fixes the issue.

Some key places that were forgotten:

• we have two fields for shard key mappings, one being the inverse - we only updated one of those fields
• replica sets also have a shard key field, we did not set it at all
• shard key mappings are sometimes known during collection creation, set it right away

A proper test for this is implemented in #6213.

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