Add REST CI test to read/write group metadata. (#4833)

Add REST CI test to read/write group metadata.
---
TYPE: NO_HISTORY

test/src/unit-capi-group.cc

@@ -5,7 +5,7 @@
  *
  * The MIT License
  *
- * @copyright Copyright (c) 2022-2023 TileDB Inc.
+ * @copyright Copyright (c) 2022-2024 TileDB Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -411,12 +411,14 @@ TEST_CASE_METHOD(
 
 TEST_CASE_METHOD(
     GroupFx,
-    "C API: Group Metadata, write/read",
-    "[capi][group][metadata][read]") {
+    "C API: Group Metadata, write/read, rest",
+    "[capi][group][metadata][rest][regression][sc-4821]") {
   // Create and open group in write mode
   // TODO: refactor for each supported FS.
-  std::string temp_dir = fs_vec_[0]->temp_dir();
-  create_temp_dir(temp_dir);
+  std::string fs_temp_dir = fs_vec_[0]->temp_dir();
+  create_temp_dir(fs_temp_dir);
+  std::string temp_dir =
+      fs_vec_[0]->is_rest() ? "tiledb://unit/" + fs_temp_dir : fs_temp_dir;
 
   std::string group1_uri = temp_dir + "group1";
   REQUIRE(tiledb_group_create(ctx_, group1_uri.c_str()) == TILEDB_OK);
@@ -510,7 +512,7 @@ TEST_CASE_METHOD(
   rc = tiledb_group_close(ctx_, group);
   REQUIRE(rc == TILEDB_OK);
   tiledb_group_free(&group);
-  remove_temp_dir(temp_dir);
+  remove_temp_dir(fs_temp_dir);
 }
 
 TEST_CASE_METHOD(