feat!: remove addons subcommand

[sarahetter]

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Summary

This also has been deprecated for more than a year and gets less than one invocation a day.

Note: this keeps addons handling in dev, serve, functions. We should add observability/find observability that lets us know how much these are being used for any future versions of the CLI

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[github-actions]

📊 Benchmark results

Comparing with afdfe46

• Dependency count: 1,214 (no change)
• Package size: 317 MB ⬇️ 0.00% decrease vs. afdfe46
• Number of ts-expect-error directives: 830 ⬇️ 2.41% decrease vs. afdfe46