Fix incorrect error message for GET /api/card endpoint

Fix bug causing test email pulses to fail

When test pulses are sent out their channel_types are strings not
keywords which caused the multimethod lookup in the pulse code to
fail. This commit adds a unit test that covers our pulse test
capability and ensures channel_type fields are keywords before
invoking the multimethod.

Fixes #6465

Fix randomly failing segment test

Literally just change an icon

Issue 5742

Add mapping for Postgres CITEXT type

Add missing comments for when migrations were added

Fix long lines in metabase.driver.generic-sql

Have Utils.isEmpty() cast its arg to String()

Compare email 'to` as a set, not a vector

Some databases have the email addresses in a different order causing
CI to fail. This commit converts the `:to` vector to a set so order
doesn't matter.

Alerts round 2

Specifically this asserts more on the contents of the email (such as
the goal that was reached) and uses the email regexing code in
metabase.email-test which has been expanded to work on multipart
emails (like pulses and alerts).

Docs for 0.27

Don't try to expand GA metrics

* add initial test

* fix resizer?

* test fix wip

* fix tests via hack

* fix flow

The correct data was coming back, just in a different order on some
databases. Put the rows into a set so that it's not sensitive to the
arbitrary order.

size select list to fit contents if smaller than the provided height

Previously the creator of the alert would be notified, but any
recipients added to the new alert were not being notified. This commit
continues to notify the creator, but then will let all of the other
recipients know that they've been subscribed to an alert.

Previously whenever an alert was deleted it would notify the creator
of the deletion, even if the creator was the one that did the
deleting. This commit changes that behavior to only notify if the
creator is different from the user deleting the alert.