doctor: add fs fault injection and lock contention coverage

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

cmd/bd/doctor/fix/sync.go

@@ -149,7 +149,7 @@ func DBJSONLSync(path string) error {
 
 // countDatabaseIssues counts the number of issues in the database.
 func countDatabaseIssues(dbPath string) (int, error) {
-	db, err := sql.Open("sqlite3", dbPath)
+	db, err := sql.Open("sqlite3", sqliteConnString(dbPath, true))
 	if err != nil {
 		return 0, fmt.Errorf("failed to open database: %w", err)
 	}