Cumulocity_Rest_API.mon populates incorrect tenantId in TenantDetails for per-tenant use cases.

When deployed in a per-tenant environment, the tenantId in the ApplicationSubscribedForTenant notification was incorrectly populated with the tenantId of the bootstrap tenant instead of the current tenant. This issue has been resolved.

Cumulocity_Rest_API.mon is not scalable with a large number of tenants.

When deployed in a multi-tenant environment, Cumulocity_Rest_API.mon used to take O(n^2) space. This issue has been resolved. It now takes a linear amount of space with respect to the number of tenants.