fixup! trace2:gvfs:experiment: prime_cache_tree

This reverts commit 2023a0c.

Reverting in favor of moving the tracing into the prime_cache_tree
function rather than the single caller in this commit.

builtin/reset.c

@@ -100,9 +100,7 @@ static int reset_index(const struct object_id *oid, int reset_type, int quiet)
 
 	if (reset_type == MIXED || reset_type == HARD) {
 		tree = parse_tree_indirect(oid);
-		trace2_region_enter("exp", "prime_cache_tree", the_repository);
 		prime_cache_tree(the_repository, the_repository->index, tree);
-		trace2_region_leave("exp", "prime_cache_tree", the_repository);
 	}
 
 	ret = 0;