* Update over_limit.html.eex

* Update dashboard_locked.html.eex

* Update dashboard_locked.html.eex

* Update over_limit.html.eex

* Update dashboard_locked.html.eex

* fix tests

* stop querying owned_site_ids three times

... when querying for billing cycles. Adds an optional `owned_site_ids`
argument to the `usage_cycle` function.

* add penultimate billing cycle info to emails

This commit also refactors some code and adds unit tests to email templates

* use delimit_integer instead of large_number_format

... to display usage with exact numbers such as 1,099,999 instead of 1M

* add penultimate cycle date ranges and linebreaks

---------

Co-authored-by: RobertJoonas <56999674+RobertJoonas@users.noreply.github.com>
Co-authored-by: Robert Joonas <robertjoonas16@gmail.com>