allowed_fstypes() returns the list of filesystem types that we are willing to mount. However, the blkid probe filter needs to detect additional non-mountable types: crypto_LUKS (so that LUKS-encrypted partitions can be identified and decrypted) and swap (so that swap partitions can be identified). Without these types in the BLKID_FLTR_ONLYIN filter, blkid reports "No type detected" for encrypted and swap partitions, causing image policy checks to fail (e.g. "encrypted was required") and mount operations to fail with "File system type not supported". Note that verity types (DM_verity_hash, verity_hash_signature) do not need to be added here because their fstype is assigned directly during partition table parsing, not via blkid probing. Follow-up for e33eb053fb.
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