Follow-up on provider names for the newly added connection strings to EnvironmentVariablesConfigurationProvider

[tarekgh]

In #116037, we added support for additional connection string prefixes to EnvironmentVariablesConfigurationProvider. This issue is intended to track whether any provider names need to be associated with the newly supported connection strings.

Below is a list of potential provider names, but they haven't been validated yet. We need to determine whether these are the correct values or if we should continue using null as the provider's name, as we currently do.

• Cosmos DB: Uses REST APIs or SDK (Microsoft.Azure.Cosmos)
• Event Hubs: Uses AMQP protocol (Azure.Messaging.EventHubs)
• Notification Hubs: Uses REST APIs (Microsoft.Azure.NotificationHubs)
• Redis Cache: Uses Redis protocol (StackExchange.Redis)
• Service Bus: Uses AMQP protocol (Azure.Messaging.ServiceBus)
• API Hub: Generic API connections, no specific provider <--- Null provider

[tarekgh]

#36123
https://learn.microsoft.com/en-us/azure/app-service/reference-app-settings?tabs=kudu%2Cdotnet#variable-prefixes
https://learn.microsoft.com/en-us/cli/azure/webapp/config/connection-string?view=azure-cli-latest#az-webapp-config-connection-string-set

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