Made changes to build and test multi-arch Beam SDK container images

[celeste-zeng]

The pull request adds the following changes:

• Adds the -Ppush-containers build parameter to push and save multi-arch containers as a manifest list.
• Explicitly adds tensorflow-cpu-aws as an additional base image requirement for Python containers when building the ARM components of the multi-arch container images.
• Configures the suite of Python ValidatesContainer tests against the Dataflow runner so that the containers built are multi-arch and being used to test.

Related issues:
Explicitly install tensorflow-cpu-aws: tensorflow/tensorflow#60751
Save multi-arch images: #26902

Design doc: https://docs.google.com/document/d/1ikbEJNsFH1D9HqiMqiVyyMlNpDgSqxXK22nUoetzW6I/edit?usp=sharing

[tvalentyn]

Run Python Dataflow ValidatesContainer

[codecov]

Codecov Report

Merging #27311 (e3d321b) into master (7bfead0) will decrease coverage by 0.01%.
Report is 4 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #27311      +/-   ##
==========================================
- Coverage   70.89%   70.89%   -0.01%     
==========================================
  Files         860      860              
  Lines      104635   104635              
==========================================
- Hits        74184    74183       -1     
- Misses      28898    28899       +1     
  Partials     1553     1553              

Flag	Coverage Δ
go	53.37% <ø> (ø)
python	80.00% <ø> (-0.01%)	⬇️

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[celeste-zeng]

Run Python Dataflow ValidatesContainer

[celeste-zeng]

Run Python Dataflow ValidatesContainer

[github-actions]

Reminder, please take a look at this pr: @tvalentyn @lostluck @Abacn

[celeste-zeng]

Changes were broken down into other PRs.