Fixed example tests

[darrelmiller]

• Removed usage of HttpClient to download example OpenAPI descriptions
• Added some new sample OpenAPI documents
• Re-enabled some tests relating to examples
• Switched some asserts to use fluent assertions.

[msftclas]

@darrelmiller,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[PerthCharern]

() [](start = 13, length = 2)

Not sure what the impact of having this bracket here is :)

[darrelmiller]

I think it's left over from me removing the skip parameter. I'll get rid of it.

[PerthCharern]

                     c.Example = new OpenApiString("xyz"); ///"{ \"foo\": \"bar\" }"; This doesn't work because parser treats it as a node

Remove this comment. We should add more tests with types other than OpenApiString in the Example property.

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Refers to: test/Microsoft.OpenApi.Tests/ExampleTests.cs:40 in 7f06092. [](commit_id = 7f06092, deletion_comment = False)

[PerthCharern]