Commit
546e8f338973541b2020f705b78e2bfbaed70c41
by noreplyfix(tidb): stabilize release-8.5 artifact prep jobs (#4449)
## Summary
- run release-8.5 `pull_e2e_test` artifact downloads in the `utils`
container so `oras` is available
- make the release-8.5 lightning job tolerate the normalized `tiflash ->
tiflash_dir/tiflash` layout produced by the OCI download helper
- stop chmod'ing every downloaded binary in the release-8.5 tidb-tools
job so root-owned artifacts from the helper do not fail the prepare
stage
## Validation
- `git diff --check`
## Related
- pingcap/tidb#67490
(commit: 546e8f3)