feat: apply sorting by amount by sales in admin.sales page

[sachinchauhan2889]

apply sorting by amount by sales in admin.sales page

Required for fossasia/open-event-frontend#7642

[codecov]

Codecov Report

Merging #8142 (ba279c2) into development (92297f9) will decrease coverage by 0.02%.
The diff coverage is 57.14%.

@@               Coverage Diff               @@
##           development    #8142      +/-   ##
===============================================
- Coverage        65.77%   65.74%   -0.03%     
===============================================
  Files              305      305              
  Lines            15773    15806      +33     
===============================================
+ Hits             10375    10392      +17     
- Misses            5398     5414      +16     

Impacted Files	Coverage Δ
app/api/admin_sales/events.py	66.66% <40.00%> (-21.43%)	⬇️
app/api/schema/events.py	98.70% <100.00%> (+0.05%)	⬆️
app/models/event.py	82.35% <100.00%> (+0.37%)	⬆️

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[maze-runnar]

resolve conflict.
changes are LGTM!!

[lgtm-com]

This pull request introduces 1 alert when merging b7403c2 into 0daf60a - view on LGTM.com

new alerts:

• 1 for Unused import

[maze-runnar]

Resolve lgtm issue.