Revert "trace2:data: add trace2 hook classification"

This reverts commit 9afaef2.

builtin/am.c

@@ -468,7 +468,6 @@ static int run_post_rewrite_hook(const struct am_state *state)
 
 	cp.in = xopen(am_path(state, "rewritten"), O_RDONLY);
 	cp.stdout_to_stderr = 1;
-	cp.trace2_hook_name = "post-rewrite";
 
 	ret = run_command(&cp);
 

builtin/receive-pack.c

@@ -694,8 +694,6 @@ static int run_and_feed_hook(const char *hook_name, feed_fn feed,
 	proc.argv = argv;
 	proc.in = -1;
 	proc.stdout_to_stderr = 1;
-	proc.trace2_hook_name = hook_name;
-
 	if (feed_state->push_options) {
 		int i;
 		for (i = 0; i < feed_state->push_options->nr; i++)
@@ -809,7 +807,6 @@ static int run_update_hook(struct command *cmd)
 	proc.stdout_to_stderr = 1;
 	proc.err = use_sideband ? -1 : 0;
 	proc.argv = argv;
-	proc.trace2_hook_name = "update";
 
 	code = start_command(&proc);
 	if (code)
@@ -1193,7 +1190,6 @@ static void run_update_post_hook(struct command *commands)
 	proc.no_stdin = 1;
 	proc.stdout_to_stderr = 1;
 	proc.err = use_sideband ? -1 : 0;
-	proc.trace2_hook_name = "post-update";
 
 	if (!start_command(&proc)) {
 		if (use_sideband)

builtin/worktree.c

@@ -401,7 +401,6 @@ static int add_worktree(const char *path, const char *refname,
 			cp.dir = path;
 			cp.env = env;
 			cp.argv = NULL;
-			cp.trace2_hook_name = "post-checkout";
 			argv_array_pushl(&cp.args, absolute_path(hook),
 					 oid_to_hex(&null_oid),
 					 oid_to_hex(&commit->object.oid),

sequencer.c

@@ -1093,7 +1093,6 @@ static int run_rewrite_hook(const struct object_id *oldoid,
 	proc.argv = argv;
 	proc.in = -1;
 	proc.stdout_to_stderr = 1;
-	proc.trace2_hook_name = "post-rewrite";
 
 	code = start_command(&proc);
 	if (code)
@@ -3731,7 +3730,6 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 				hook.in = open(rebase_path_rewritten_list(),
 					O_RDONLY);
 				hook.stdout_to_stderr = 1;
-				hook.trace2_hook_name = "post-rewrite";
 				argv_array_push(&hook.args, post_rewrite_hook);
 				argv_array_push(&hook.args, "rebase");
 				/* we don't care if this hook failed */

transport.c

@@ -1061,7 +1061,6 @@ static int run_pre_push_hook(struct transport *transport,
 
 	proc.argv = argv;
 	proc.in = -1;
-	proc.trace2_hook_name = "pre-push";
 
 	if (start_command(&proc)) {
 		finish_command(&proc);