tests: allow list breaching min resident size in statvfs test (#8358)

## Problem
This test would sometimes violate the min resident size during disk
eviction and fail due to the generate warning log.

Disk usage candidate collection only takes into account active tenants.
However, the statvfs call takes into account the entire tenants
directory, which includes tenants which haven't become active yet.

After re-starting the pageserver, disk usage eviction may kick in
*before* both tenants have become active. Hence, the logic will try to satisfy
thedisk usage requirements by evicting everything belonging to the active
tenant, and hence violating the tenant minimum resident size.

## Summary of changes

Allow the warning

test_runner/regress/test_disk_usage_eviction.py

@@ -794,6 +794,16 @@ def less_than_max_usage_pct():
 
     wait_until(2, 2, less_than_max_usage_pct)
 
+    # Disk usage candidate collection only takes into account active tenants.
+    # However, the statvfs call takes into account the entire tenants directory,
+    # which includes tenants which haven't become active yet.
+    #
+    # After re-starting the pageserver, disk usage eviction may kick in *before*
+    # both tenants have become active. Hence, the logic will try to satisfy the
+    # disk usage requirements by evicting everything belonging to the active tenant,
+    # and hence violating the tenant minimum resident size.
+    env.neon_env.pageserver.allowed_errors.append(".*" + GLOBAL_LRU_LOG_LINE)
+
 
 def test_statvfs_pressure_min_avail_bytes(eviction_env: EvictionEnv):
     """