Replace old used-to-be-GORM datastructures (#104305) with sqlc-generated
structs. This also makes it possible to use more specific structs that
are more taylored to the specific queries, increasing efficiency.
This commit covers job blocklists and last-rendered images.
Functional changes are kept to a minimum, as the API still serves the
same data.
Because this work covers so much of Flamenco's code, it's been split up
into different commits. Each commit brings Flamenco to a state where it
compiles and unit tests pass. Only the result of the final commit has
actually been tested properly.
Ref: #104343
94d71bc3c9