[data] Fix pandas import failures by moving it to a top-level data import #32447
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Why are these changes needed?
This fixes #32435
I still do not know the exact root cause. I tried bisecting as far back as streaming worked, and it still happened before (though less frequently). It's possible this was a long outstanding issue.
I am not able to reproduce without streaming.
This PR sidesteps the issue by making pandas a normal import, which does not trigger the issue.
Related issue number
Closes #32435