[FEAT]: Octokit.NotFoundExceptions should have a public parameterless constructor to allow for consumers to easily unit test

[EmilyThomasPCTY]

Describe the need

In order for a consumer to easily unit test when Octokit.NotFoundException is thrown
As a consumer
I want Octokit.NotFoundException to have a public parameterless constructor
So that I can easily use FakeItEasy to Throw<Octokit.NotFoundException>() for consumer testing purposes.

This could easily be abstracted out to apply to other models as well to make consumers' unit testing easier.

SDK Version

No response

API Version

No response

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct