[CI] add a big GPU marker to run memory-intensive tests separately on CI (#9691)
* add a marker for big gpu tests
* update
* trigger on PRs temporarily.
* onnx
* fix
* total memory
* fixes
* reduce memory threshold.
* bigger gpu
* empty
* g6e
* Apply suggestions from code review
* address comments.
* fix
* fix
* fix
* fix
* fix
* okay
* further reduce.
* updates
* remove
* updates
* updates
* updates
* updates
* fixes
* fixes
* updates.
* fix
* workflow fixes.
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Co-authored-by: Aryan <aryan@huggingface.co>