rubocops: Add HTTP URL check for formulae and casks

[p-linnane]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew lgtm (style, typechecking and tests) with your changes locally?

---

After some internal discussion we've decided to no longer allow HTTP URLs in Homebrew/core and Homebrew/cask. This doesn't include mirrors since we often use them for bootstrapping.

This should produce numerous failures right now, but it'll allow us to review them.

[Copilot]

Pull request overview

This PR adds RuboCop rules to disallow HTTP URLs (http://) in Homebrew/core and Homebrew/cask repositories, while allowing HTTP for mirror URLs in formulae since they may be needed for bootstrapping.

Key changes:

• Adds HttpUrls cop for formulae to detect and auto-correct http:// URLs to https://
• Extends cask URL cop to detect and auto-correct http:// URLs to https://
• Both cops only apply to homebrew-core and homebrew-cask taps respectively

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
Library/Homebrew/rubocops/urls.rb	Adds new HttpUrls FormulaCop that flags http:// URLs in homebrew-core formulae (excluding mirrors) and provides auto-correction to https://
Library/Homebrew/rubocops/cask/url.rb	Extends the existing Url cop to check for http:// URLs in homebrew-cask and provides auto-correction to https://
Library/Homebrew/test/rubocops/urls/http_spec.rb	Adds comprehensive test coverage for the new formula HttpUrls cop including offense detection, auto-correction, tap filtering, and mirror URL exclusion
Library/Homebrew/test/rubocops/cask/url_spec.rb	Adds test coverage for http:// URL detection in casks including offense detection, auto-correction, tap filtering, and https:// URL acceptance

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[daeho-ro]

Recently we got an error frequently,

Top 3 slowest examples (535.28 seconds, 58.1% of total time):
  Utils::Svn::remote_exists? when svn is available returns true when remote exists
    494.03 seconds ./test/utils/svn_spec.rb:49
  Homebrew::Cmd::Reinstall reinstalls a Formula
    23.6 seconds ./test/cmd/reinstall_spec.rb:10
  Homebrew::Cmd::InstallCmd when using a bottle installs a Formula
    17.65 seconds ./test/cmd/install_spec.rb:18

Top 3 slowest example groups:
  Utils::Svn
    82.45 seconds average (494.7 seconds / 6 examples) ./test/utils/svn_spec.rb:5
  Homebrew::Cmd::Reinstall
    12.3 seconds average (24.59 seconds / 2 examples) ./test/cmd/reinstall_spec.rb:7
  Homebrew::Cmd::InstallCmd
    9.68 seconds average (48.38 seconds / 5 examples) ./test/cmd/install_spec.rb:6