Fix data loading and loading state

This commit reduces the number of test runner workers for Jest tests
from 10 to 8. This will use less memory and hopefully avoid Circle CI
4GB memory limit test failures. It also fixes some tests that have
nested `it` clauses. This doesn't run correctly on older versions of
Jest and will fail fast on newer versions of Jest.

Fixes #6790

HTML markup isn't supported inside an internationalized string

This was inadvertantly excluded from the pulse attachments
commit (de61b731).

This primarily focuses on a time picker rather than the date picker
when users are attempting to filter based on a time column. There are
also some minor changes to how time field results are displayed/formatted.

Previously this was done by the frontend, including boolean that
enables it. This moves the logic to the backend.

This commit adds attachment support to the pulse frontend. This commit
also automatically adds CSV attachments to alerts that are on "rows"
queries.