Drop TagInspectionMetadata model, DbSet, and table

Removes the model, DbSet, and database table. The data previously
stored here is now owned by TaskDefinition.ZoomDescription and edited
via PATCH /missionDefinitions/{id}.

Author: aeshub

backend/api/Database/Context/FlotillaDbContext.cs

@@ -27,7 +27,6 @@ public FlotillaDbContext(DbContextOptions options)
         public DbSet<ExclusionArea> ExclusionAreas => Set<ExclusionArea>();
         public DbSet<AccessRole> AccessRoles => Set<AccessRole>();
         public DbSet<UserInfo> UserInfos => Set<UserInfo>();
-        public DbSet<TagInspectionMetadata> TagInspectionMetadata => Set<TagInspectionMetadata>();
         public DbSet<AutoScheduleFrequency> AutoScheduleFrequency => Set<AutoScheduleFrequency>();
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)