CI: Remove variants arg from `package` step (#62858)
* Remove variants arg from package step
* Fix starlark lint
* Default to releaseModeConfig.Variants
* Check for empty variants arg
(cherry picked from commit e5c48ac945)
CI: Remove variants arg from `package` step (#62858)
* Remove variants arg from package step
* Fix starlark lint
* Default to releaseModeConfig.Variants
* Check for empty variants arg
(cherry picked from commit e5c48ac945)