feat(publisher-github): add debug support for Octokit

[malept]

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

Hooks the debug module into Octokit's logging mechanism. You can enable info messages by adding electron-forge:publisher:github:info to the DEBUG environment variable, and debug messages by adding electron-forge:publisher:github:debug to the DEBUG environment variable. Please note that both will be enabled if you already have electron-forge:* in the DEBUG environment variable.

Also does some cleanup while working on the module (namely, using the userAgent option instead of setting a header).

Addresses #2498.
Fixes #1672.
Closes #1673.

[codecov]

Codecov Report

Merging #2499 (e400c86) into master (34ba06e) will increase coverage by 1.27%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master    #2499      +/-   ##
==========================================
+ Coverage   73.98%   75.26%   +1.27%     
==========================================
  Files          91       91              
  Lines        2364     2369       +5     
  Branches      446      448       +2     
==========================================
+ Hits         1749     1783      +34     
+ Misses        511      473      -38     
- Partials      104      113       +9     

Impacted Files	Coverage Δ
packages/publisher/github/src/util/github.ts	91.30% <71.42%> (-8.70%)	⬇️
packages/maker/base/src/Maker.ts	75.67% <0.00%> (+2.70%)	⬆️
packages/api/core/src/api/lint.ts	69.23% <0.00%> (+3.84%)	⬆️
packages/maker/appx/src/MakerAppX.ts	57.14% <0.00%> (+17.85%)	⬆️
packages/maker/wix/src/MakerWix.ts	86.36% <0.00%> (+40.90%)	⬆️
packages/maker/squirrel/src/MakerSquirrel.ts	78.26% <0.00%> (+43.47%)	⬆️

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[malept]

There appears to be an unrelated problem with CI in general, with the native modules support. Can't really merge with that there (since it'll affect the main branch anyway).

[malept]

There appears to be an unrelated problem with CI in general, with the native modules support. Can't really merge with that there (since it'll affect the main branch anyway).

I guess it was a weird transient error? Although I did repro this locally the other day, so this is very confusing.