ENH: Register OOC format from DataIOCollection ctor; fix in-core Data Format tests

* DataIOCollection's constructor registers the OOC format via
  SimplnxOoc::registerIOManager under SIMPLNX_USE_OOC, so getManager("HDF5-OOC")
  resolves in the compile-time-switch OOC build.
* IOFormat: guard the in-core large-data-format preference tests to
  #ifndef SIMPLNX_USE_OOC (the OOC-build defaults are covered by SimplnxOoc's
  DataFormatPreferenceTest) and update the "not configured" assertion to the
  seeded k_InMemoryFormat default.

Signed-off-by: Joey Kleingers <joey.kleingers@bluequartz.net>

Author: joeykleingers

test/IOFormat.cpp

@@ -51,9 +51,8 @@ TEST_CASE("Data Format: Not configured defaults to InMemory store", "[IOTest][Da
   REQUIRE(prefs->largeDataFormat() == Preferences::k_InMemoryFormat);
   REQUIRE_FALSE(prefs->useOocData());
 
-  // The resolver-aware CreateDataStore should produce an InMemory store under
-  // these conditions because the registered resolver (none in the in-core build)
-  // returns "" → default in-memory.
+  // The resolver-aware CreateDataStore should produce an InMemory store: with no
+  // OOC compiled in, the resolver is bypassed and storage is always in-memory.
   DataStructure ds;
   DataPath dp({"TestArray"});
   auto store = DataStoreUtilities::CreateDataStore<float32>(ds, dp, {100, 100, 100}, {1}, IDataAction::Mode::Execute);