Adopt org-infra reusable Homebrew workflow for formula publishing

[sonupreetam]

Is your feature request related to a problem? Please describe.

complyctl's Homebrew formula publishing is implemented as an inline step in PR #742 using heredoc + sed placeholder templating. This approach is fragile and will drift from other repos (complypack) that need the same capability. A reusable workflow is being built in org-infra (complytime/org-infra#500) to standardize Homebrew source-build formula publishing.

Describe the solution you'd like

Replace the inline Homebrew job in release.yml with a caller to complytime/org-infra/.github/workflows/reusable_release_homebrew.yml, passing complyctl-specific inputs (tag, project_name, tap_repo, go_main_path, ldflags_module).

This supersedes #787 items 1 (unauthenticated clone), 2 (retry backoff), 3 (double .git guard), and 6 (remote branch pre-flight). Items 4 (GitHub App confirmation) and 5 (Go version alignment) remain valid independently.

Blocked by: complytime/org-infra#500

Describe alternatives you've considered

Merging PR #742 as-is with the inline implementation. This works but creates a maintenance burden when complypack adopts Homebrew and both implementations need to stay in sync.

Additional context

• complyctl uses a GitHub App (APP_ID_HOMEBREW_FORMULA_PUBLISHER) for cross-repo auth to complytime/homebrew-tap
• The formula is source-build (user's machine compiles with Go), avoiding macOS Gatekeeper/signing concerns
• Shell completions (Bash, Zsh, Fish) are installed by the formula via generate_completions_from_executable
• Related: #713 (original Homebrew request)