Unskip one and skip another relative datetime test (#36580)

* Revert "Temporarily skip server-side-relative-datetime-honeysql-form (#36567)"

This reverts commit 769b5eb4.
This was not flaking.

* Skip test that flakes

modules/drivers/redshift/test/metabase/driver/redshift_test.clj

@@ -4,7 +4,7 @@
    [clojure.string :as str]
    [clojure.test :refer :all]
    [honey.sql :as sql]
-   #_[java-time.api :as t]
+   [java-time.api :as t]
    [metabase.driver :as driver]
    [metabase.driver.redshift :as redshift]
    [metabase.driver.sql-jdbc.connection :as sql-jdbc.conn]
@@ -578,7 +578,8 @@
   ;; => 108
   )
 
-(deftest server-side-relative-datetime-various-units-test
+;;;; Flakes in CI around 0400 UTC. Investigating.
+#_(deftest server-side-relative-datetime-various-units-test
   (mt/test-driver
    :redshift
    (mt/with-metadata-provider (mt/id)
@@ -588,8 +589,7 @@
                :let [test-thunk (getdate-vs-ss-ts-test-thunk-generator unit value)]]
          (test-thunk))))))
 
-;; Dec 8th 2023, Temporarily skip this to unblock master, QP should fix this soon
-#_(deftest server-side-relative-datetime-truncation-test
+(deftest server-side-relative-datetime-truncation-test
   (mt/test-driver
    :redshift
    (testing "Datetime _truncation_ works correctly over different timezones"