remove QC0 from csst-msc-l1-ast

csst_dag/dag_config/csst-msc-l1-ast.yml

 name: csst-msc-l1-ast
 tasks:
-- name: QC0
-  image: csst-msc-l1-qc0
 - name: AST
-  dependencies: [QC0]
   image: csst-msc-l1-ast
 - name: SSO
   dependencies: [AST]