fix: Remove ability to delete orders

[codedsun]

Fixes #7423

Short description of what this resolves:

feat: Remove soft deletion from Order Schema, Delete endpoint removed

Changes proposed in this pull request:

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.

[iamareebjamal]

Model not changed, no migration created, no query changed

[codedsun]

@iamareebjamal - review now!

[codecov]

Codecov Report

Merging #7460 (847dc8e) into development (4c8922b) will increase coverage by 0.01%.
The diff coverage is 77.77%.

@@               Coverage Diff               @@
##           development    #7460      +/-   ##
===============================================
+ Coverage        65.39%   65.40%   +0.01%     
===============================================
  Files              265      265              
  Lines            13236    13229       -7     
===============================================
- Hits              8656     8653       -3     
+ Misses            4580     4576       -4     

Impacted Files	Coverage Δ
app/api/attendees.py	56.55% <ø> (ø)
app/api/helpers/order.py	63.04% <0.00%> (ø)
app/models/discount_code.py	94.00% <ø> (ø)
app/api/orders.py	43.73% <66.66%> (+0.34%)	⬆️
app/api/schema/orders.py	96.82% <100.00%> (-0.05%)	⬇️
app/models/order.py	88.37% <100.00%> (-0.14%)	⬇️

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