npm CLI option to disable deprecation warnings

[ericcornelissen]

The npm CLI has several flags to disable certain things like auditing with --no-audit, the update notifier with --no-update-notifier, and funding messages with --no-fund. Given this project to manage deprecations, it would be useful for users to disable deprecation warnings on the CLI too to reduce noise.

[ericcornelissen]

The proposal in npm/cli#7633 would partially address it, but even then - like --no-audit - I think it would be beneficial to have an --no-deprecations options.