ref: remove events-orga endpoint

[codedsun]

Fixes #6710

Short description of what this resolves:

ref: remove events-orga endpoint

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.

[codedsun]

@iamareebjamal As the issue states -

Create proper sales stats API if needed

The frontend is working fine after removing this afaik, what else needs to be tested here?

[codecov]

Codecov Report

Merging #6714 into development will decrease coverage by 0.04%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #6714      +/-   ##
===============================================
- Coverage         65.6%   65.56%   -0.05%     
===============================================
  Files              303      300       -3     
  Lines            15353    15268      -85     
===============================================
- Hits             10073    10011      -62     
+ Misses            5280     5257      -23

Impacted Files	Coverage Δ
app/api/schema/events.py	91.33% <ø> (-0.07%)	⬇️
app/api/routes.py	100% <ø> (ø)	⬆️
app/models/event.py	78.7% <ø> (-0.23%)	⬇️
app/models/event_orga.py

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[iamareebjamal]

A migration should be created to remove the table from DB

[codedsun]

@iamareebjamal - Done check