Add trial and update users_over_license_count in CurrentLicenseType

What does this MR do and why?

This MRs adds a field to the CurrentLicenseType (field name trial) that returns whether the license is a trial, so that we can show a message to the user based on this information. Message will be added in !155475

We are also updating the field users_over_license_count to return the actual number of users over the license user count even if the license is a trial. This due to the feedback raised in #386586, where we realized that showing 0 for user overage causes confusion to the customer.

MR acceptance checklist

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