Enable collection IDs for OCI remotes

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We want to use collection IDs to specify what remote to install from
when processing /etc/flatpak/preinstall.d; in order for this to work
for OCI remotes, we need to permit collection IDs.

 - In flatpakrepo files, don't require a GPGKey for a OCI remote
   with a collection - we don't have signature verification for GPG remotes.
 - Don't validate that the collection ID appears in the summary -
   the image index doesn't currently contain an image ID

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