BB8-11630: Add confirmation for production env vars setting/deleting

[rebeccahum]

Description

Adds a confirmation prompt when setting or deleting an env vars on production environments:

╰─$ vip @5190.production config envvar set EXAMPLE_ENV_VAR                                                                                                                            130 ↵
? Are you sure you want to set the environment variable EXAMPLE_ENV_VAR on PRODUCTION for site rebecca-testing-2? (y/N) › false

╰─$ vip @5190.production config envvar delete EXAMPLE_ENV_VAR
? Are you sure you want to delete the environment variable EXAMPLE_ENV_VAR on PRODUCTION for site rebecca-testing-2? (y/N) › false

Pull request checklist

• Update SETUP.md with any new environmental variables.
• Update the documentation.
• Manually test the relevant changes.
• Follow the pull request checklist
• Add/update automated tests as needed.

New release checklist

• Automated tests pass.
• The Preparing for release checklist is completed.

Steps to Test

Outline the steps to test and verify the PR here.

Example:

1. Check out PR.
2. Run npm run build
3. Run vip @5190.production config envvar set EXAMPLE_ENV_VAR and expect confirmation prompt
4. Run the previous step now with --skip-confirmation and expect no confirmation prompt

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Manifest Files

[sonarqubecloud]

Quality Gate failed

Failed conditions
94.7% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud