test(control-plane): speed up link-failure detection to avoid timeout flake

A persistently-failing link is only marked LINK_FAILED once reconciler
requeues exhaust, with exponential backoff (base x 2^n). At max_requeues=10
that's ~51s of cumulative backoff, which exceeds the wait_auth_link timeout
under slow llvm-cov runs and caused failure-expecting tests (wrong creds,
missing workload API) to flake. Lower to 7 (~6s to fail). Recovery tests are
unaffected — they recover via a fresh node registration, not the requeue chain
(verified locally).

Signed-off-by: Luca Muscariello <muscariello@ieee.org>

Author: muscariello

crates/control-plane/tests/integration_test.rs

@@ -100,7 +100,14 @@ fn reserve_port() -> u16 {
 
 fn test_reconciler_config() -> ReconcilerConfig {
     ReconcilerConfig {
-        max_requeues: 10,
+        // Keep this low: a persistently-failing link is only marked LINK_FAILED
+        // after requeues exhaust, and the delay grows exponentially (base × 2^n).
+        // With 10 requeues that's ~51s of cumulative backoff, which blows the
+        // `wait_auth_link` timeout under slow llvm-cov runs. 7 → ~6s to fail,
+        // still leaving retry margin for slow-to-connect links. Recovery tests
+        // are unaffected (they recover via a fresh node registration, not the
+        // requeue chain).
+        max_requeues: 7,
         base_retry_delay: Duration::from_millis(50).into(),
         reconcile_period: Duration::from_secs(0).into(),
         enable_orphan_detection: false,