* add line chart test
* add empty state option to line chart
* add empty state test
* add tooltip coverage
* add test files
* add monthly usage tests
* finish tests
* tidying
* address comments, add average test
* finish tests broken from calendar
* alphabetize utils
* add util to add namespace key
* finish filtering
* add fake data for filtering
* address comments
* add empty state for no new client counts, when filtered by namespace
* fix mirage clients linting
* re-add namespaces to month object
* clean up filtering
* add tests and refactor accordingly
* fix tooltip bug and chart new month client chart not rendering
* filter out undefined
* optional method chaining
* add filter and fix ticks for line chart
* fix axes domains
* fix average calculation
* clean up activity serailizer
* fix line chart so only plot months with data
* cleanup monthly serializer
* account for empty months in vertical bar chart
* tidy version upgrade info
* fix version history model typo
* extract const into helper
* add upgrade indicator to line chart
* fix tests
* add todos
* adds serializer
* removes all 1.11 related work to monthly/new client counting
* move from new-init-activity to activity
* merge setup changes add monthly model/adapter
* delete new-init-activity files
* add graph to current month view
