Remove MetaBot data permissions; over 2 dozen new MetaBot tests

src/metabase/api/search.clj

src/metabase/integrations/slack.clj

src/metabase/metabot/command.clj

src/metabase/metabot/events.clj

src/metabase/metabot/slack.clj

src/metabase/models/collection.clj

src/metabase/models/database.clj

src/metabase/models/permissions.clj

src/metabase/pulse.clj

src/metabase/sync/analyze/fingerprint.clj

src/metabase/util.clj

test/metabase/metabot/command_test.clj

test/metabase/metabot/events_test.clj

test/metabase/metabot/test_util.clj

test/metabase/models/collection_test.clj

test/metabase/models/permissions_group_test.clj

test/metabase/models/permissions_test.clj