fix(shorebird_cli): update cache artifacts on every command run, log progress

[bryanoltman]

Description

Updates shorebird_cli to ensure all cache artifacts are up-to-date before running any command and prints the update progress, if any. This ensures:

1. We will always know that cache artifacts are up-to-date in any command.
2. Cache artifacts are updated in a consistent and predictable place.
3. Users have better visibility into what the CLI is doing (see the fixed issue).

Fixes https://github.com/shorebirdtech/shorebird/issues/1899

Type of Change

• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
• [x] 🧹 Code refactor
• [ ] ✅ Build configuration change
• [ ] 📝 Documentation
• [ ] 🗑️ Chore

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.60%. Comparing base (7652dc6) to head (6a6034f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1958 +/- ## ============================================ - Coverage 100.00% 87.60% -12.40% ============================================ Files 174 174 Lines 5506 5504 -2 ============================================ - Hits 5506 4822 -684 - Misses 0 682 +682 ``` | [Flag](https://app.codecov.io/gh/shorebirdtech/shorebird/pull/1958/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech) | Coverage Δ | | |---|---|---| | [shorebird_cli](https://app.codecov.io/gh/shorebirdtech/shorebird/pull/1958/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech) | `84.05% <100.00%> (-15.95%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech#carryforward-flags-in-the-pull-request-comment) to find out more.

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