Add additional verify tests

[keahpeters]

Resolves: #2811

This PR introduces equivalent snapshot tests for the majority of the unit tests in SwaggerGeneratorTests.

• Added snapshot tests that mirror most of the existing unit tests in SwaggerGeneratorTests.
• Unit tests that focus on specific conditions or exceptions being thrown are not duplicated as snapshot tests.
• Snapshot tests complement the existing unit tests and ensure generated Swagger documents are as expected.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.10%. Comparing base (a97c53f) to head (df2d00b).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2950   +/-   ##
=======================================
  Coverage   90.10%   90.10%           
=======================================
  Files          72       72           
  Lines        2730     2730           
  Branches      432      432           
=======================================
  Hits         2460     2460           
  Misses        270      270           

Flag	Coverage Δ
Linux	90.10% <ø> (ø)
Windows	90.10% <ø> (+9.65%)	⬆️
macOS	?

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[martincostello]

Awesome work!

[martincostello]

Looks like we're hitting MAX_PATH issues with the Windows build though: https://github.com/domaindrivendev/Swashbuckle.AspNetCore/actions/runs/9537731930/job/26287650221?pr=2950#step:2:61

[mesMess]

Just pulled this from fresh and the path limit is still an issue.
No issues on Mac or Linux.
Was this tested after resolution?

error: unable to create file test/Swashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGeneratorVerifyTests/SwaggerGeneratorVerifyTests.IllegalHeaderParameterWithOpenApiOperation_action=ActionWithAuthorizationFromHeaderParameter.verified.txt: Filename too long
fatal: unable to checkout working tree
warning: Clone succeeded, but checkout failed.

[martincostello]

It was tested in so far as the CI no longer had the issue after changes were made, and other people have made contributions without issue.

How long is the path you're cloning the repo into?

[mesMess]

On Windows, 261 (default limit is 260) characters.
On Unix and Linux, no problems.
I can shorten the base directory on Windows (or mod the registry) was just curious. In either case the name of that file is too long for no reason.