Manager: remove introduction comments from the query SQL

Remove the introductionary comments from `query_jobs.sql` and
`query_workers.sql`. Sqlc got confused by this, and placed them in the
wrong (well, not-intended-by-me) place in the generated Go code.

No functional changes.

internal/manager/persistence/sqlc/query_jobs.sql

@@ -1,7 +1,4 @@
 
--- Jobs / Tasks queries
---
-
 -- name: CreateJob :exec
 INSERT INTO jobs (
   created_at,

internal/manager/persistence/sqlc/query_jobs.sql.go

@@ -64,7 +64,6 @@ func (q *Queries) CountWorkersFailingTask(ctx context.Context, taskID int64) (in
 }
 
 const createJob = `-- name: CreateJob :exec
-
 INSERT INTO jobs (
   created_at,
   uuid,
@@ -93,7 +92,6 @@ type CreateJobParams struct {
 	StorageShamanCheckoutID string
 }
 
-// Jobs / Tasks queries
 func (q *Queries) CreateJob(ctx context.Context, arg CreateJobParams) error {
 	_, err := q.db.ExecContext(ctx, createJob,
 		arg.CreatedAt,

internal/manager/persistence/sqlc/query_workers.sql

@@ -1,7 +1,4 @@
 
--- Worker queries
---
-
 -- name: CreateWorker :one
 INSERT INTO workers (
   created_at,

internal/manager/persistence/sqlc/query_workers.sql.go

@@ -27,7 +27,6 @@ func (q *Queries) AddWorkerTagMembership(ctx context.Context, arg AddWorkerTagMe
 }
 
 const createWorker = `-- name: CreateWorker :one
-
 INSERT INTO workers (
   created_at,
   uuid,
@@ -79,7 +78,6 @@ type CreateWorkerParams struct {
 	CanRestart         bool
 }
 
-// Worker queries
 func (q *Queries) CreateWorker(ctx context.Context, arg CreateWorkerParams) (int64, error) {
 	row := q.db.QueryRowContext(ctx, createWorker,
 		arg.CreatedAt,