Changes

feat(pingcap-inc/tici): update tici pull-e2e job to pre-install tiflash from OCI (#4279)

Depends on https://github.com/PingCAP-QE/artifacts/pull/905

test result: 

https://prow.tidb.net/view/gs/prow-tidb-logs/pr-logs/pull/pingcap-inc_tici/929/pull-e2e/2028734174122217472
<img width="823" height="444" alt="image"
src="https://github.com/user-attachments/assets/240859c9-2c04-49ad-9b54-d71add981e29"
/>
<img width="873" height="537" alt="image"
src="https://github.com/user-attachments/assets/2636ecc7-67d5-4ab2-8af9-5e2ca2457dd5"
/>

---------

Signed-off-by: lyb <yebin.li@pingcap.com>
 (commit: 935f578)