feat: Normalize custom form fields to snake case

[iamareebjamal]

Fix for #7074

[houndci-bot]

Black would make changes.

[niranjan94]

Here is an overview of what got changed by this pull request:

Complexity increasing per file
==============================
- tests/all/unit/api/helpers/test_utilities.py  9
- app/api/helpers/fields.py  1
         

Clones removed
==============
+ tests/all/integration/api/attendee/test_attendee_api.py  -2
         

See the complete overview on Codacy

[codecov]

Codecov Report

Merging #7078 into development will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development    #7078      +/-   ##
===============================================
+ Coverage        61.86%   61.92%   +0.06%     
===============================================
  Files              261      262       +1     
  Lines            12940    12961      +21     
===============================================
+ Hits              8005     8026      +21     
  Misses            4935     4935              

Impacted Files	Coverage Δ
app/api/helpers/custom_forms.py	100.00% <ø> (ø)
app/api/helpers/fields.py	100.00% <100.00%> (ø)
app/api/helpers/utilities.py	73.07% <100.00%> (+4.42%)	⬆️
app/api/schema/attendees.py	100.00% <100.00%> (ø)
app/api/schema/sessions.py	87.65% <100.00%> (+0.15%)	⬆️
app/api/schema/speakers.py	97.87% <100.00%> (+0.04%)	⬆️
app/models/custom_form.py	98.00% <100.00%> (+0.04%)	⬆️

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[lgtm-com]

This pull request introduces 1 alert when merging da21129 into 7950499 - view on LGTM.com

new alerts:

• 1 for Unused import