feat: output warning of deno removal from installation scripts

[zimeg]

Changelog

Starting September 1, 2025 the Slack CLI installation script will no longer include deno as part of the installation. We recommend installing deno separately and configuring CI systems as needed if deno is used for application development, such as for ROSI apps.

Summary

This PR outputs a warning that deno will be removed from installation scripts at a future date: September 1, 2025.

Preview

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.95%. Comparing base (986c433) to head (d9c6327).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
- Coverage   62.97%   62.95%   -0.03%     
==========================================
  Files         212      212              
  Lines       21585    21585              
==========================================
- Hits        13594    13589       -5     
- Misses       6945     6948       +3     
- Partials     1046     1048       +2     

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[zimeg]

🗣️ The output on powershell might match this:

[zimeg]

📝 Open to all comments and suggestions, but I'll mark this as "ready for review" for now with plans to improve error outputs for a missing runtime in a follow up PR!

[mwbrooks]

✅ Looks good to me! Thanks for putting together this PR.

🖥️ Visually, this looks as good as we can hope and I appreciate that you've added some recommended next steps for folks who need to manually install Deno.

⏭️ Can we plan some follow-ups to make sure that the CLI commands error gracefully when Deno is missing and provides a link to docs on how to setup Deno?

[zimeg]

@mwbrooks Thanks so much for the kind review!

I'm hoping this stands out a bit more than other outputs to catch the eye, but I'm also looking forward to removing these lines from the script.

Let's merge this now, but please know I'll begin a fast follow for graceful errors soon. I like the idea of including recommended docs with this! 🚢 💨