Avoid network calls during autocomplete initialization

Autocompletion script is triggering update checks

I have the autocomplete setup in my .zshrc as instructed by the CLI when running twilio autocomplete zsh:

eval $(twilio autocomplete:script zsh)

However each time I start my shell, I get this reminder that there is an update available:

 ›   Warning: twilio-cli update available from 5.3.2 to 5.3.3. For more information: https://twil.io/cli

It should probably be disabled in this case as this update check:

• Makes a network call and slows shell initialization down when ZSH is evaluating .zshrc.
• Is not very useful when the CLI is installed through a package manager that is taking care of keeping the CLI updated.

So either disabling the check in this particular context or having a configuration parameter to disable update checks globally (and as a bonus, set it to not execute checks when the CLI is installed through a package manager) would solve this.

Steps to Reproduce

1. Follow autocomplete setup instructions.
2. Open a shell when an update is ready.
3. Wait...and see the reminder

Technical details:

• twilio-cli version: twilio-cli/5.3.2 darwin-x64
• node version: node-v19.0.0
• Command output with debug logging enabled (adding -l debug to the end of the command): N/A

Start with the twilio autocomplete:script zsh entry point and reproduce the update warning while evaluating the generated command in .zshrc. Trace how autocomplete initialization invokes update checks, then verify that initialization makes no network call or displays an update reminder while normal CLI update checks remain covered.