fix: remove workaround for extracting instance name from snapshot operation [WD-14541]

[mas-who]

Done

• previously, an operation for creating an instance from a snapshot would include the snapshot name in the instances resource field within the operation response metadata. We had to include a workaround to filter out the snapshots in order to extract the instance name.
• with this upstream PR merged, we can now remove the workaround

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @mas-who or @edlerd for access.
   • With a local copy of this branch, build and run as described in the docs.
2. Perform the following QA steps:
   • Create an instance from a snapshot
   • Make sure that the operation shows the new instance name

[webteam-app]

Demo

Jenkins

demos.haus

[mas-who]

@edlerd I tried refreshing my lxd snap on latest/edge channel and I see the commit isn't pointing at the latest on main branch yet. It could be getting released to the snap channel still, so we may have to wait a bit before testing again.

[edlerd]

LGTM