fix: Setup flake8 to stop turning trailing commas into tuples

[cogk]

There was a couple of unwanted single element tuples (abc,) in the codebase because of automated re-formatting.

I tried finding more by searching for the string ,) but I only found these.

I added flake8-tuple to prevent this kind of automatically introduced bug from happening again

[codecov]

Codecov Report

Merging #36850 (a150119) into develop (9d330a1) will increase coverage by 0.00%.
Report is 15 commits behind head on develop.
The diff coverage is 69.23%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #36850   +/-   ##
========================================
  Coverage    65.42%   65.42%           
========================================
  Files          794      794           
  Lines        62172    62172           
========================================
+ Hits         40673    40674    +1     
+ Misses       21499    21498    -1     

Files Changed	Coverage Δ
..._integrations/connectors/woocommerce_connection.py	0.00% <0.00%> (ø)
...xt/accounts/doctype/payment_entry/payment_entry.py	83.50% <100.00%> (ø)
erpnext/controllers/accounts_controller.py	86.11% <100.00%> (ø)
erpnext/controllers/selling_controller.py	80.88% <100.00%> (ø)
erpnext/e_commerce/shopping_cart/cart.py	52.39% <100.00%> (ø)
...cturing/doctype/production_plan/production_plan.py	80.26% <100.00%> (ø)

... and 1 file with indirect coverage changes