The bulk decryption logic in deployment deserialization did not recur
into slices or maps. This prevented the bulk decryption of nested secret
values. These changes fix that bug, improve test coverage, and refactor
the bulk decryption code for simplicity, clarity, and separation of
concerns.
Related to https://github.com/pulumi/home/issues/1842.
This takes the existing `apitype.Checkpoint` type and renames it to
`apitype.CheckpointV1` locking in the shape. In addition, we introduce
a `apitype.VersionedCheckpoint` type, which holds a version number and
a json document representing a checkpoint at that version. Now, when
reading a checkpoint, the CLI can determine if it's in a format it
understands, and fail gracefully if it is not.
While the CLI understands the older checkpoint version, it always
writes the newest version format, meaning that if you manage a
fire-and-forget stack with this version of the CLI, it will be
un-readable by previous versions.
Stacks managed by Pulumi.com are not impacted by this change.
Fixes: #887