feat(scm/api/hook): create in-house webhook redelivery method

[ecrupper]

Part of the effort for go-vela/community#459

Includes:

• New endpoint to redeliver a webhook using the go-github API
• Setting hook.WebhookID field during the ProcessWebhook function
• Some updates to DB tests due to some parallel changes to the pipeline story, see: feat: add database and library pipeline type types#223

Why is this a draft?

• Currently using non-versioned instance of the go-github library. Will update to latest version when they release it.

Things to note:

• It is necessary that whichever users adopt this have a version of GitHub that is 3.2 or higher. Otherwise, there will be 415 errors when trying to execute. I added some error handling for that in this PR.

[codecov]

Codecov Report

Merging #622 (f1f268e) into master (5b0c408) will decrease coverage by 0.13%.
The diff coverage is 31.03%.

@@            Coverage Diff             @@
##           master     #622      +/-   ##
==========================================
- Coverage   55.48%   55.34%   -0.14%     
==========================================
  Files         195      195              
  Lines       15749    15836      +87     
==========================================
+ Hits         8738     8765      +27     
- Misses       6646     6702      +56     
- Partials      365      369       +4     

Impacted Files	Coverage Δ
api/hook.go	0.00% <0.00%> (ø)
compiler/registry/github/github.go	100.00% <ø> (ø)
compiler/registry/github/template.go	58.53% <ø> (ø)
scm/github/access.go	95.28% <ø> (ø)
scm/github/authentication.go	80.95% <ø> (ø)
scm/github/changeset.go	87.03% <ø> (ø)
scm/github/deployment.go	87.74% <ø> (ø)
scm/github/github.go	100.00% <ø> (ø)
scm/github/repo.go	73.89% <ø> (ø)
scm/github/webhook.go	87.25% <62.79%> (-2.95%)	⬇️

[KellyMerrick]

lgtm