* Verify active database for `GET api/health`

Previously unconditionally responded with 200, status "ok" if we were
done initializing, even when we had 1500 stale db connections
somehow ().

Now attempt to connect to the database:

```shell
❯ http get localhost:3000/api/health -pb
{
    "status": "ok"
}

❯ http get localhost:3000/api/health
HTTP/1.1 503 Service Unavailable
...
{
    "status": "Error getting db connection"
}
```

and logging to the server
```
2022-05-10 22:05:16,911 WARN server.routes :: Error in api/health database check
java.lang.ArithmeticException: Divide by zero
	at clojure.lang.Numbers.divide(Numbers.java:190)
	at clojure.lang.Numbers.divide(Numbers.java:3911)
	at metabase.server.routes$fn__122320.invokeStatic(routes.clj:51)
```

* Reuse `sql-jdbc.conn/can-connect-with-spec?` for api/health

* Add flag to setting names type

* Add writeback on/off selector

* add react-refresh to webpack dev config

See https://github.com/metabase/metabase/issues/22561 for context.

* Add `Dataset` mock function

* Add query builder redux state type

* Add query builder redux state mock helper

* show cloud migration help tooltip when setup is finished

* update link

Previously identifier isn't fully specified (with schema and table) in nested field column description in syncing. Now it is!

Co-authored-by: Noah Moss <32746338+noahmoss@users.noreply.github.com>

Co-authored-by: Noah Moss <32746338+noahmoss@users.noreply.github.com>

* Fix automagic dashboards for queries with source queries

* Replace ->entity with a multimethod

* Remove unused namespace

* Fix Cypress test

* Add `experimental-enable-actions` feature flag

* Simplify Ring middleware

* Sort namespaces

* Make sure api.actions is loaded

Do not render "Add your own data" button if user does not have permissions to create database (#22339)

* Add some space between unit tests

* Unit test aggregation operator getters

* Minor refactoring

* Rename `getAggregationOperators`

* Rename `getAggregationOperatorsWithFields`

* fix ldap requires uid to do group sync

* fix ee test

Retry sending notifications (pulses/alerts) for about one minute

The parameters of the exponential backoff can be configured via settings.

* fix save button is enabled when users do not have a permission to save a question

* do not show new button

* hide reload query button when users do not have permissions

* update specs

* types

* review

* clear download perms when setting block perms

* test

* fix function call

* Repro #22408: Block permissions obstructing download permissions set to "No" (#22435)

Co-authored-by: Nemanja Glumac <31325167+nemanjaglumac@users.noreply.github.com>

* Fix :Postgres :day-of-week extracts coming back as 0..6 instead of 1..7

* Test Tuesday-Saturday per @dpsutton suggestion and fix issues with those as well 

* Fix MongoDB for Tuesday