test(e2e): cover on-demand migration faults, concurrency and interactions (#7085)

* test(odm): add the fault, concurrency, interaction and real-source e2e

Twenty-one scenarios for on-demand migration: source failures and the
circuit breaker, single-flight and the pull-concurrency limits, how a
pulled object composes with encryption, Object Lock, quota, events,
replication, delete markers and the disable switch, and two cases against
a real second RustFS as the source.

Every assertion carries a source-request-count dimension so a case cannot
pass by serving the client while quietly re-reading the source.

* ci(odm): route the slow on-demand-migration e2e to the nightly lane

The fault, concurrency and real-source modules wait out the 30 s breaker
window, drive 100-deep bursts, or start extra RustFS processes, so they
join e2e-nightly and are subtracted from the e2e-full merge budget. The
e2e-smoke selection is unchanged.

.config/e2e-full-selection.txt

@@ -1,2 +1,2 @@
-sha256-darwin=9dccb0cd537cf79ae70c1c20e8281d36d03f2f09f81142a5341e26e3dc18709d
+sha256-darwin=09bc29b3e0ed7c5779331740e18e1d5ca05cb240c1363d1ecc95c1ef1e337038
 sha256-linux=86e69337ad1440252a2ee20a12063c989ed12442d3b1ddf9e9233acf0f2ec089

.config/e2e-nightly-selection.txt

@@ -1 +1 @@
-sha256=d06524b44de97ed8f62b0fd8cf9fa504e3cd520ffcaacc32691d6f890ebe7f20
+sha256=e58d2993aef56373d52ea40dfc6733fef42865195a71ccbd3883b0fafd84da75

.config/nextest.toml

@@ -475,10 +475,20 @@ path = "junit.xml"
 # loss, quorum, cleanup, notification fan-in, or admin-timeout behavior. The
 # consolidated nightly workflow runs them serially to avoid resource
 # starvation; failures are never retried.
+#
+# On-demand migration (backlog#2158 ODM-11) joins by the second clause: the
+# fault matrix waits out the 30 s circuit-breaker window, the concurrency
+# matrix drives 100-deep bursts, and the real-source cases start a second
+# (loop guard: a third) RustFS process. They are too slow or too heavy for
+# the merge budget; `on_demand_migration::{get_basic,interaction}_test` stay
+# in e2e-full, which excludes exactly these three modules.
 [profile.e2e-nightly]
 default-filter = """
     package(e2e_test)
-    & test(/^(admin_timeout_regression_test|cluster_concurrency_test|cluster_multidrive_pool_test|degraded_listing_availability_test|heal_erasure_disk_rebuild_test|namespace_lock_quorum_test|object_lambda_test|stale_multipart_cleanup_cluster_test)::/)
+    & (
+        test(/^(admin_timeout_regression_test|cluster_concurrency_test|cluster_multidrive_pool_test|degraded_listing_availability_test|heal_erasure_disk_rebuild_test|namespace_lock_quorum_test|object_lambda_test|stale_multipart_cleanup_cluster_test)::/)
+        | test(/^on_demand_migration::(concurrency_test|fault_test|real_source_test)::/)
+    )
 """
 fail-fast = false
 
@@ -536,6 +546,7 @@ default-filter = """
     & !test(/^protocols::/)
     & !test(/^(admin_timeout_regression_test|cluster_concurrency_test|cluster_multidrive_pool_test|degraded_listing_availability_test|heal_erasure_disk_rebuild_test|namespace_lock_quorum_test|object_lambda_test|stale_multipart_cleanup_cluster_test)::/)
     & !test(/^replication_extension_test::/)
+    & !test(/^on_demand_migration::(concurrency_test|fault_test|real_source_test)::/)
 """
 fail-fast = false