feat: Add support for setting client URLs

[stevehipwell]

This PR adds support for setting the URLs without making changes to the path prefix as happens when using github.WithEnterpriseURLs. This function is useful when mocking the GitHub API as without it all test servers need modifying to add the GHAS prefix.

@gmlewis sorry but this might be worthy of a patch release, I discovered my oversight when I was wiring the new version up in the TF provider and while I was able to get the tests working I needed to modify the paths.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.46%. Comparing base (5475166) to head (37edab9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4240   +/-   ##
=======================================
  Coverage   97.45%   97.46%           
=======================================
  Files         189      190    +1     
  Lines       19164    19178   +14     
=======================================
+ Hits        18677    18691   +14     
  Misses        270      270           
  Partials      217      217           

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[gmlewis]

LGTM.
Awaiting second LGTM+Approval from any other contributor to the repo before merging.

cc: @alexandear - @zyfy29 - @Not-Dhananjay-Mishra - @munlicode

[munlicode]

LGTM

[gmlewis]

Thank you, @munlicode!
Merging.

[stevehipwell]

@gmlewis would it be possible to get a patch out for this?

[gmlewis]

@gmlewis would it be possible to get a patch out for this?

I may be able to do one this weekend.

[gmlewis]

@gmlewis would it be possible to get a patch out for this?

I may be able to do one this weekend.

@stevehipwell - this is now available here:
https://github.com/google/go-github/releases/tag/v88.0.0