[FullStory] Demote the deployment information to setVars instead of setUserVars

[afharo]

The way we treat users in FullStory they don't belong to a specific deployment because they can own multiple deployments.

For that reason, we shouldn't store the version and cloudId context at the user level. This issue is to demote these properties to call setVars instead of the current setUserVars:

The relevant piece of code:

kibana/packages/analytics/shippers/fullstory/src/fullstory_shipper.ts

Lines 75 to 84 in 7226982

	// User-level context
	if (version || cloudId) {
	this.initContext.logger.debug(
	`Calling FS.setUserVars with version ${version} and cloudId ${cloudId}`
	);
	this.fullStoryApi.setUserVars({
	...(version ? getParsedVersion(version) : {}),
	...(cloudId ? { org_id_str: cloudId } : {}),
	});
	}

NOTE: This change contains breaking changes and may affect any existing dashboards in FullStory.

cc @lizozom @elastic/platform-analytics

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)