* Reduce chat provider usage
* Clear out IChat props
* Delete interactive session provider API
* Totally remove static chat provider registration
* Clean up onDidRegisterProvider events
* Remove provider ID references from model
* Eliminate many 'providerId' references
* Simplify view registration
* Clean up participant-specific actions
* Delete getProviderInfos
* Rename context key
* Fix tests
* Fix action label
* Fix view title
* Fix test
* Fix test
* Fix integration test
* Remove more providerId
* Add API stub to make this compatible with the existing Copilot Chat
Rob Lourens
ed6c6d3f28