test(utils): add rustfs-test-utils crate and shared ECStore bootstrap (#4850)

* test(utils): add rustfs-test-utils crate, absorb heal/iam ECStore bootstrap

backlog#1153 infra-1. The ~50-line "build a real temp-disk ECStore"
bootstrap was copy-pasted (and drifting) across the heal and iam
integration tests. This adds crates/test-utils (rustfs-test-utils, a
dev-dependency-only crate) owning that bootstrap and converts the four
copies into thin wrappers:

- TestECStoreEnvBuilder: disk_count (default 4), prefix (uuid-suffixed
  /tmp dir), base_dir (caller-owned dir, e.g. tempfile::TempDir),
  init_bucket_metadata (default true; the iam bootstrap test opts out
  to preserve its historical semantics). TestECStoreEnv exposes
  temp_root/disk_paths/ecstore plus a versioned-bucket helper, and
  init_tracing() replaces the per-file Once blocks.
- All rustfs_ecstore imports stay behind src/ecstore_test_compat.rs,
  the sanctioned test-compat boundary pattern (mirrors
  crates/iam/tests/ecstore_test_compat).
- heal: heal_integration_test / heal_b5_versioned_regression_test /
  heal_b920_subquorum_union_test drop their setup_test_env{,_n} copies
  for heal_env{,_n} wrappers; the tests/storage_api.rs integration
  surface shrinks to what test bodies still touch.
- iam: iam_bootstrap_no_lock_test drops build_local_ecstore; its
  ecstore_test_compat fixture shrinks to SetupType +
  update_erasure_type.

rg 'async fn setup_test_env' crates/heal crates/iam now returns 0.
Scanner's lifecycle tests are deliberately NOT absorbed (gated on
ilm-1; 14 of 15 are #[ignore]d today). Net -230 lines.

* fix(heal): drop tokio::fs import orphaned by the b920 bootstrap move

* fix(heal): drop tokio::fs import orphaned by the b5 bootstrap move

crates/iam/tests/ecstore_test_compat/mod.rs

@@ -22,9 +22,7 @@
 
 #[allow(unused_imports)]
 pub(crate) mod fixture {
-    pub(crate) use rustfs_ecstore::api::disk::endpoint::Endpoint;
-    pub(crate) use rustfs_ecstore::api::layout::{EndpointServerPools, Endpoints, PoolEndpoints, SetupType};
-    pub(crate) use rustfs_ecstore::api::storage::{ECStore, init_local_disks};
+    pub(crate) use rustfs_ecstore::api::layout::SetupType;
 
     // `update_erasure_type` is a write-side global facade entry. Its use is
     // restricted to reviewed storage_api boundaries; this test-only module is