feat: Group tax in calculate order amount

[iamareebjamal]

No description provided.

[codecov]

Codecov Report

Merging #7033 into development will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #7033   +/-   ##
============================================
  Coverage        60.55%   60.56%           
============================================
  Files              259      259           
  Lines            12872    12874    +2     
============================================
+ Hits              7795     7797    +2     
  Misses            5077     5077           

Impacted Files	Coverage Δ
app/api/helpers/order.py	65.28% <100.00%> (+0.58%)	⬆️

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[lgtm-com]

This pull request introduces 1 alert when merging 59696f3 into 97ea87a - view on LGTM.com

new alerts:

• 1 for Variable defined multiple times