base_tier_validation: tier definition 'sequence' is used as a priority

[gurneyalex]

When using base_tier_definition, there is a field called "sequence" which can be used to request validations in a specific order.

When I see such a field, I expect the records to be processed by increasing sequence (so sequence = 10 is before sequence = 20). However the sorting in the code is done by decreasing sequence, which is super confusing for end users. Changing the sorting would likely break all instances using the feature; so not a great move. We should at least get a clear explanation in the UI.