GOATS-724: Add --ci flag for installing GOATS.

[davner]

Jira Ticket: GOATS-724

Checklist

• Added or reviewed a release note in doc/changes.

Needed a way to bypass the prompts so I can test in CI pipeline.

[codecov]

Codecov Report

❌ Patch coverage is 5.00000% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.80%. Comparing base (4b8ec02) to head (9701184).
⚠️ Report is 99 commits behind head on main.

Files with missing lines	Patch %	Lines
src/goats_setup/management/commands/goats_setup.py	0.00%	17 Missing ⚠️
src/goats_cli/cli.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
- Coverage   74.93%   74.80%   -0.14%     
==========================================
  Files         231      231              
  Lines        7075     7089      +14     
  Branches      461      465       +4     
==========================================
+ Hits         5302     5303       +1     
- Misses       1689     1702      +13     
  Partials       84       84              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.