[CI/Build] Move nightly wheel index generation to a single post-build step (#38322)
Signed-off-by: Shengqi Chen <harry-chen@outlook.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>