Provide env.uriScheme to CCloud connections' ccloud_config

[shouples]

Requires confluentinc/ide-sidecar#288 to be complete first.

We will need to start passing the URI scheme (vscode, vscode-insiders, etc) to CCloud connections via the spec.ccloud_config so CCloud auth redirects will point at the product/distribution that originally created the connection. This also means we will need to make the (currently static) CCloud connection ID also use the URI scheme in the event a user wants to sign in with the extension across multiple products.

vscode/src/constants.ts

Lines 41 to 49 in 40816c4

	/** Single CCloud connection spec to be used with the sidecar Connections API. */
	export const CCLOUD_CONNECTION_SPEC: ConnectionSpec = {
	id: "vscode-confluent-cloud-connection",
	name: "Confluent Cloud",
	type: "CCLOUD",
	};
	// these two avoid the need to use `CCLOUD_CONNECTION_SPEC.id!` or `CCLOUD_CONNECTION_SPEC.name!`
	// everywhere in the codebase
	export const CCLOUD_CONNECTION_ID = CCLOUD_CONNECTION_SPEC.id! as ConnectionId;