destinations: update schedule notification list to use destinations

[mastercactapus]

Description:
This PR updates the schedule on-call notification list to use destinations when the experimental flag is set

Which issue(s) this PR fixes:
part of #2639

Out of Scope:

• create/edit/form functionality will be done separately

Describe any introduced user-facing changes:
N/A, behavior should be the same as today, with the exception of Slack now using the team/workspace icon instead of the generic slack icon.

Describe any introduced API changes:

• added dest as a field on OnCallNotificationRule
• added missing experimental flag decorators to destinationFieldSearch and destinationFieldValueName
• removed unused typeInfo field from Destination type
• renamed unused display field from Destination type to displayInfo and implemented it's resolver

Screenshots:

Additional Info:

• Moved destination icon rendering to a new DestinationAvatar component so it can be used on chips as well as FlatList