[PRE-MERGE CHERRY-PICK OF #6389]: build: terminate long running tests

configures nextest to kill tests after 1 minute. slow period is set to
20s which is how long our tests currently take, there will be 3 warnings
and then the test will be killed and it's output logged.

(cherry picked from commit 31d2624)

.config/nextest.toml

@@ -1,2 +1,2 @@
 [profile.default]
-slow-timeout = "1m"
+slow-timeout = { period = "20s", terminate-after = 3 }