Add guest link and update format of virtual hearings link

[sahalliburton]

Resolves #13936

Description

Updated Hearing Details UI based on figma diagram: https://www.figma.com/file/V87TZArfdurCGJiEjQ73ES/Virtual-Hearings?node-id=425%3A15036

Acceptance Criteria

• Code compiles correctly
• User sees "Scheduling in progress" when conference is being created and emails generated
• User sees virtual hearing details and a button to copy both guest and host link when the virtual hearing has been scheduled
• User sees expired when the virtual hearing is past or if it is cancelled

Testing Plan

1. Select judge "BVAYELLOW": http://localhost:3000/test/users
2. Navigate to hearings: http://localhost:3000/hearings/schedule
3. Choose a "Video" hearing
4. Click the "Edit hearing details" link
5. Ensure you do not see any virtual hearing details
6. Change from a "Video" hearing to a "Virtual" hearing and ensure you see the "Scheduling in progress" label
7. Once the virtual hearing has been scheduled, confirm that you see details for both the host and guest based on the Figma diagram above.
8. Change the hearing back to "Video" and ensure that you see the expired status based on the Figma diagram

User Facing Changes

BEFORE	AFTER
Previous Virtual Hearing
Virtual Hearing in progress
Virtual Hearing Active

[va-bot]

	1 Warning
⚠️	This is a Big PR. Try to break this down if possible. Stacked pull requests encourage more detailed and thorough code reviews

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[tomas-nava]

🗣 Looks great to me!

Not approved, because the changes in #14099 broke the new functionality; virtual_hearings/hearing_details_spec.rb feature tests are failing in Circle and locally. Specifically, alias is no longer serialized with the virtual hearing, it's now alias_with_host with different content. Update to fix and I think this'll be good to go!

[rubaiyat22]

This looks great to me! I think it'll be good to go once the change for polling is made