Display checksum status on import

To utilise the work done on introducing checksum calculation, this PR enables Insight to display a visual indicator (green tick, tick with small red cross, red cross) when checksums fail respectively for: no files, some files, all files from a file set. Additionally a tooltip provides visual feedback to the user indicating checksum mismatches by printing the failure in bold.

To test, start an upload and verify that an icon is displayed next to the import row in the importer window.