Dynamic group booking follow-up

[alishaz-polymath]

What does this PR do?

• Updates default slugs
• Updates WHAT in success page for Dynamic bookings to include group individuals' names
• Updates WHERE message to improve the message accuracy
• Updates WHAT in cancellation email for dynamic group events

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

• Test A

[vercel]

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docs – ./apps/docs

🔍 Inspect: https://vercel.com/cal/docs/Craf7oKFGkUwZGN7QhL1CrzdK9bD
✅ Preview: https://docs-git-dynamic-group-followup-cal.vercel.app

calendso – ./apps/web

🔍 Inspect: https://vercel.com/cal/calendso/5kfHKtEtU4dqaBdpmYVWgrGTeX7u
✅ Preview: https://calendso-git-dynamic-group-followup-cal.vercel.app

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