Update base image requirements for Python SDK container images.

[celeste-zeng]

• Add tensorflow-cpu-aws as an additional requirement to build multi-arch Python SDK container images.
• Detailse see: https://docs.google.com/document/d/1ikbEJNsFH1D9HqiMqiVyyMlNpDgSqxXK22nUoetzW6I/edit#heading=h.ubbbuwmiojof

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[codecov]

Codecov Report

Merging #27789 (0b02f8c) into master (a1dd170) will not change coverage.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #27789   +/-   ##
=======================================
  Coverage   70.95%   70.95%           
=======================================
  Files         860      860           
  Lines      104866   104866           
=======================================
  Hits        74408    74408           
  Misses      28899    28899           
  Partials     1559     1559           

Flag	Coverage Δ
go	53.66% <ø> (ø)
python	80.00% <ø> (ø)

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