feat: Improve no availability message and host assignment process

[RajdeepDs]

What does this PR do?

This PR added UI improvements to guide admins to add hosts to team event types and avoid confusion around the availability message.

• Fixes #21487
• Fixes CAL-5820

Visual Demo (For contributors especially)

https://www.loom.com/share/d16878290d4840fc8fecf06a7c8235ac?sid=2046d2a4-3410-4c14-a3be-f14f09ec6106

Mandatory Tasks (DO NOT REMOVE)

• [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
• [x] N/A I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• [x] I confirm automated tests are in place that prove my fix is effective or that my feature works.

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Summary by cubic

Improved the no availability message and host assignment process to help admins add hosts to team event types and reduce confusion.

• UI Improvements
  • Added clear warnings and badges when no hosts are assigned.
  • Updated dialogs and inline banners to guide admins to add hosts.
  • Improved navigation to the host assignment tab.

[vercel[bot]]

@RajdeepDs is attempting to deploy a commit to the cal Team on Vercel.

A member of the Team first needs to authorize it.

[graphite-app[bot]]

Graphite Automations

"Add community label" took an action on this PR • (05/24/25)

1 label was added to this PR based on Keith Williams's automation.

[github-actions[bot]]

This PR is being marked as stale due to inactivity.

[kart1ka]

Making it draft. Feel free to rfr once the comments are addressed.

[github-actions[bot]]

This PR is being marked as stale due to inactivity.

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[anikdhabal]

Close due to inactivity. Feel free to reopen if you wanted to continue