Update MiscellaneousClient to ApiClient approach and add pagination support to GetAllLicenses.

[gdziadkiewicz]

Fixes #1663

• Remove convention test exclusion
• Add ApiOptions overload
  • make existing methods call new overload with ApiOptions.None
• Update unit tests
  • Adjust for ApiOptions parameter
  • Add null/"" checks for ApiOptions overloads
• Add pagination Integration tests

[ryangribble]

Whoa I didn't even realise we had an ApiClient in the codebase that didn't use the ApiClient base class, nice pickup! 🎉

I guess the only thing is that in order to prove these changes are good, we will need integration tests for all the methods in this client, not just the paginated ones 😉

[codecov]

Codecov Report

Merging #1716 into master will increase coverage by 0.08%.
The diff coverage is 70.83%.

@@            Coverage Diff             @@
##           master    #1716      +/-   ##
==========================================
+ Coverage   66.86%   66.94%   +0.08%     
==========================================
  Files         542      542              
  Lines       14241    14223      -18     
==========================================
  Hits         9522     9522              
+ Misses       4719     4701      -18

Impacted Files	Coverage Δ
Octokit/GitHubClient.cs	80.64% <100%> (ø)	⬆️
....Reactive/Clients/ObservableMiscellaneousClient.cs	78.57% <50%> (+1.64%)	⬆️
Octokit/Helpers/ApiUrls.cs	97.97% <66.66%> (-0.65%)	⬇️
Octokit/Clients/MiscellaneousClient.cs	71.42% <75%> (+11.9%)	⬆️
Octokit/Models/Response/LicenseMetadata.cs	88.23% <0%> (+47.05%)	⬆️

[shiftkey]

release_notes: add pagination support to client.Miscellaneous.GetAllLicenses();

[shiftkey]

@gdziadkiewicz thanks for getting this going! I decided to push it over the finish line and add in the missing integration tests. If it all goes green now, I'm gonna merge and include it in the next update.