fix: AWS file upload

[AmitAronovitch]

Fixes #6706

Short description of what this resolves:

• With this fix, I can upload images to aws storage without the failure described in failure when saving images to aws bucket storage #6706.
• Might reduce memory consumption when uploading large images.

Changes proposed in this pull request:

• In storage helper, open uploaded files as bytestream 'rb' instead of unicode
• For aws storage, avoid re-loading the data to memory (use the fileobject for the boto call).

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• All the functions created/modified in this PR contain relevant docstrings.

[codecov]

Codecov Report

Merging #6707 into development will increase coverage by 0.06%.
The diff coverage is 89.65%.

@@               Coverage Diff               @@
##           development    #6707      +/-   ##
===============================================
+ Coverage        65.61%   65.68%   +0.06%     
===============================================
  Files              300      300              
  Lines            15381    15404      +23     
===============================================
+ Hits             10093    10118      +25     
+ Misses            5288     5286       -2

Impacted Files	Coverage Δ
tests/all/unit/api/helpers/test_storage.py	98.14% <100%> (+0.85%)	⬆️
app/api/helpers/storage.py	63.02% <72.72%> (+3.73%)	⬆️

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[iamareebjamal]

Thanks for the contribution