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.

Previously alerts were showing up as pulses. This commit adds a
distinction between pulses and alerts

Xray insights batch1 lastminute fixes

Relax defsetting precondition for descriptions

Change Druid queries so that their weeks start on Sunday [ci drivers]

Add report-timezone support for Redshift

Go ahead and sync the sample dataset

Previously the code would only allow a string literal for a
description. This poses problems for i18n strings, i.e. `(tru "my
string")`, which evaluates to a string, but at macro expansion time is
not a string. This removes that precondition. The string is still
validated at runtime via schema.

By default Druid weeks start on Monday, but the rest of Metabase
expects that the weeks start on Sunday. This commit adds an `origin`
clause to `week` granularity queries which will force Sunday as the
start of the week.

Fixes #6047

Not sure when it was added, but Redshift now supports specifying a
timezone. It looks like Redshift has a similar bug to Oracle for unix
timestamps (written up as #5789) in that it's interpretting the UTC
timestamps as in the report timezone already, rather than adjusting.

Fixes #6279

Add support for sending alert emails via a background thread

Previously notifications of alert lifecycles (i.e. subscribing to an
alert, or being removed from an alert) was happening on the HTTP
request thread. When the SMTP server was slow, this would slow down
the response and thus the UI. This instead returns immediately and
connects to the SMTP server via a background thread separately from
the HTTP request thread.

Make sure to require clj namespaces before we import their classes

Java 9 test fix