Introduce annotate_int_field_verbose function
It will be used to convert the int field values to the verbose names.
Device.health -> 4 -> "Maintenance"
Usuallt the get_FOO_display can be used to get the verbose name but that requires fetching the entire model which is not available when values() or values_list() is used.
Instead the When-Case-Values construct can be used to annotate
with verbose name the values on the database. The
annotate_int_field_verbose will create those annotations using
the Django field metadata.
This technique was already used in 2be1e2b2 but is now in a separate function and can be applied to other tables.