feat: Implement deleting custom form field

[codepool867]

Fixes #4596

Short description of what this resolves:

Implemented removing function for custom form field added.

Changes proposed in this pull request:

-Attendee form's template should be changed
-Remove action is inserted into the Attendee form component
-In custom table template, remove cell is activated

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter 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)

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[codecov]

Codecov Report

Merging #5661 (d0c36a6) into development (efa056c) will increase coverage by 0.04%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #5661      +/-   ##
===============================================
+ Coverage        23.73%   23.78%   +0.04%     
===============================================
  Files              498      509      +11     
  Lines             5275     5412     +137     
  Branches            47       59      +12     
===============================================
+ Hits              1252     1287      +35     
- Misses            4015     4110      +95     
- Partials             8       15       +7     

Impacted Files	Coverage Δ
app/components/forms/wizard/attendee-step.js	0.00% <0.00%> (ø)
app/components/forms/wizard/custom-forms/table.ts	50.00% <ø> (ø)
app/components/footer-main.js	66.66% <0.00%> (-23.34%)	⬇️
app/components/forms/user-payment-info-form.js	26.66% <0.00%> (-1.91%)	⬇️
app/routes/application.js	83.78% <0.00%> (-1.59%)	⬇️
app/components/modals/modal-base.js	22.85% <0.00%> (-1.39%)	⬇️
app/router.js	100.00% <0.00%> (ø)
app/routes/index.js	78.57% <0.00%> (ø)
app/services/settings.js	66.66% <0.00%> (ø)
app/controllers/application.js	46.15% <0.00%> (ø)
... and 18 more

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[iamareebjamal]

There needs to be a popup - "Are you sure you want to delete this?" before it gets deleted