refactor: align Homebrew repo handling with Scoop

[radeksimko]

This change should be practically no-op from functional perspective, however it does introduce 2 deprecations in the brews section:

The following individual GitHub/GitLab sections:

brews:
  -
    github:
      owner: github-owner
      name: homebrew-tap

brews:
  -
    gitlab:
      owner: gitlab-owner
      name: homebrew-tap

are proposed to be deprecated in favour of a single section

brews:
  -
    tap:
      owner: repo-owner
      name: homebrew-tap

which aligns Homebrew with Scoop:

scoop:
  bucket:
    owner: user
    name: scoop-bucket

This better communicates to the end-user what will happen anyway. e.g. previously one could define brews[].gitlab and while providing GitHub token - in which case we'd generate GitHub URLs and still attempt to upload the formula to GitHub (presumably failing to do so).

This makes it more obvious that one cannot publish "cross provider", e.g. release from GitHub repo and publish formula to GitLab tap. I don't think that would be a very common scenario anyway and the user can still set skip_upload: true and upload it themselves.

---

This was mainly motivated by #1547 and #1643

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/goreleaser/goreleaser/1km52as10
✅ Preview: https://goreleaser-git-unify-brew-and-scoop.goreleaser.vercel.app

[codecov]

Codecov Report

Merging #1649 into master will decrease coverage by 0.32%.
The diff coverage is 75.38%.

@@            Coverage Diff             @@
##           master    #1649      +/-   ##
==========================================
- Coverage   85.32%   85.00%   -0.33%     
==========================================
  Files          70       70              
  Lines        3891     3894       +3     
==========================================
- Hits         3320     3310      -10     
- Misses        467      477      +10     
- Partials      104      107       +3     

Impacted Files	Coverage Δ
internal/client/gitea.go	98.13% <0.00%> (-1.87%)	⬇️
pkg/config/config.go	94.44% <ø> (ø)
internal/client/client.go	87.50% <60.00%> (-12.50%)	⬇️
internal/pipe/brew/brew.go	84.00% <65.00%> (-4.24%)	⬇️
internal/pipe/scoop/scoop.go	88.39% <75.00%> (-3.14%)	⬇️
internal/client/github.go	31.66% <100.00%> (+4.23%)	⬆️
internal/client/gitlab.go	14.76% <100.00%> (+2.93%)	⬆️
internal/deprecate/deprecate.go	100.00% <100.00%> (ø)
internal/pipe/defaults/defaults.go	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 345b917...9182825. Read the comment docs.

[caarlos0]

awesome, thanks! 🙏

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.