Skip check for custom_metadata in test for mcap storage plugin.

- Rationale:
Mcap storage doesn't store serialized metadata in bag directly on Iron
and Humble. Backporting of the relevant #1423 is not possible without
updating mcap vendor package to the v1.1.0 because we have dependencies
from the mcap_reader_->metadataIndexes(); API which became available
only in the foxglove/mcap#902

Signed-off-by: Michael Orlov <[email protected]>

Author: morlov-apexai

rosbag2_tests/test/rosbag2_tests/test_reindexer.cpp

@@ -132,7 +132,15 @@ TEST_P(ReindexTestFixture, test_multiple_files) {
 
   EXPECT_EQ(generated_metadata.storage_identifier, GetParam());
   EXPECT_EQ(generated_metadata.version, target_metadata.version);
-  EXPECT_EQ(generated_metadata.custom_data, target_metadata.custom_data);
+
+  if (GetParam() != "mcap") {
+    // Skip check for mcap storage since it doesn't store serialized metadata in bag directly on
+    // Iron and Humble. Backporting of the relevant #1423 is not possible without updating
+    // mcap vendor package to the v1.1.0 because we have dependencies from the
+    // mcap_reader_->metadataIndexes(); API which became available only in the
+    // https://github.com/foxglove/mcap/pull/902
+    EXPECT_EQ(generated_metadata.custom_data, target_metadata.custom_data);
+  }
 
   for (const auto & gen_rel_path : generated_metadata.relative_file_paths) {
     EXPECT_TRUE(