Update agent-run tests for lease-free worker

Drop the lease, heartbeat, and stale-recovery test coverage that no
longer applies, and add coverage for the new behaviour: graceful
suspend returning a run to PENDING, an approval interruption parking it
in AWAITING_APPROVAL, and SubmitApproval merging decisions and
requeuing the run. Exercise the submitAgentRunApproval mutation end to
end, including the authorization paths for the relocated policies.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/agentrun/internal_test.go

@@ -79,21 +79,6 @@ func TestWorkerOptions(t *testing.T) {
 		},
 	)
 
-	t.Run(
-		"lease duration updates only when positive",
-		func(t *testing.T) {
-			t.Parallel()
-
-			cfg := workerConfig{leaseDuration: 5 * time.Second}
-
-			WithWorkerLeaseDuration(-1)(&cfg)
-			assert.Equal(t, 5*time.Second, cfg.leaseDuration)
-
-			WithWorkerLeaseDuration(12 * time.Second)(&cfg)
-			assert.Equal(t, 12*time.Second, cfg.leaseDuration)
-		},
-	)
-
 	t.Run(
 		"max concurrency updates only when positive",
 		func(t *testing.T) {