fix(brew): skip prereleases and add mustache templating for formula names

[BYK]

Summary

This PR addresses two issues with the Brew target from #391:

1. Prerelease skip: Homebrew doesn't understand prerelease versions like 2.0.0-beta.0, so the Brew target now skips publishing for any preview/prerelease version.

2. Mustache templating for formula names: The formula config option now supports Mustache-style templates with version variables, allowing versioned formula names that prevent older major patches from overriding newer versions.

Usage

brew:
  tap: getsentry/tools
  formula: 'sentry-cli-v{{{major}}}'  # Creates sentry-cli-v1, sentry-cli-v2, etc.
  template: |
    class SentryCliV{{ major }} < Formula
      # ...
    end

Supported template variables

• {{{version}}}: Full version string (e.g., "10.2.3")
• {{{major}}}: Major version number (e.g., "10")
• {{{minor}}}: Minor version number (e.g., "2")
• {{{patch}}}: Patch version number (e.g., "3")

This follows the same pattern as the AWS Lambda Layer target's layerName templating.

Fixes #391.

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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Bug Fixes 🐛

• (brew) Skip prereleases and add mustache templating for formula names by BYK in #682

• (changelog) Disable author mentions in PR preview comments by BYK in #684
• (github) Clean up orphaned draft releases on publish failure by BYK in #681
• (publish) Fail early on dirty git repository by BYK in #683

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[armcknight]

The strategy looks good to help mitigate the last-write-wins issue with homebrew. I can't really help with typescript language/framework details here though.

[armcknight]

👍🏻