Add posibility to Ignore properties in FromForm Request with SwaggerIgnore attribute

[jgarciadelanoceda]

Ignore Properties in FromForm requests

This PR fixes #2919.

In the PR #2610, the project added the SwaggerIgnore attribute, which can ignore Methods from being populated into OpenApi doc or just properties of an object. But it did not added the possibility when the object is one that comes from a FromForm request so I am adding it in this PR

Since this is my first contribution, I am not sure if I have to do a UnitTest to test this behaviour, but in the Basic sample app I inserted a new Endpoint, that you can see the Swagger to see what this PR is addressing.

[martincostello]

Thanks for your contribution!

I am not sure if I have to do a UnitTest to test this behaviour

Yep, we'll need tests please. We need to ensure that things don't get broken in the future, as well as work as expected before we merge. Your PR should "prove" that the issue is indeed fixed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 90.10%. Comparing base (ace3015) to head (90d76cb).
Report is 2 commits behind head on master.

Files	Patch %	Lines
...re.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs	85.71%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2928   +/-   ##
=======================================
  Coverage   90.10%   90.10%           
=======================================
  Files          72       72           
  Lines        2728     2730    +2     
  Branches      431      432    +1     
=======================================
+ Hits         2458     2460    +2     
  Misses        270      270           

Flag	Coverage Δ
Linux	90.10% <85.71%> (+<0.01%)	⬆️
Windows	90.10% <85.71%> (+<0.01%)	⬆️
macOS	90.10% <85.71%> (+<0.01%)	⬆️

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