bootctl: show more information about boot entry state in list

Let's improve display of boot entries and show what type they have (i.e.
boot loader spec type 1, or type 2, or auto-discovered or reported by
boot loader), and in particular mark entries the boot loader discovered
but we can't find (i.e. that likely vanished, or possibly couldn't be
found due to a misconfiguration) and that the boot loader didn't find
but we see (which are new, or possibly also the result of
misconfiguraiton).

This is supposed to be a replacement for #22161, but instead of hiding
vanished entries, highlights them, which I think is more appropriate for
a low-level tool such bootctl.

Replaces: #22161 #22398

src/shared/bootspec.c

@@ -561,7 +561,7 @@ static int boot_entries_find_unified(
         return 0;
 }
 
-static bool find_nonunique(BootEntry *entries, size_t n_entries, bool *arr) {
+static bool find_nonunique(const BootEntry *entries, size_t n_entries, bool arr[]) {
         size_t i, j;
         bool non_unique = false;
 
@@ -833,11 +833,15 @@ int boot_entries_augment_from_loader(
          * already included there. */
 
         STRV_FOREACH(i, found_by_loader) {
+                BootEntry *existing;
                 _cleanup_free_ char *c = NULL, *t = NULL, *p = NULL;
                 char **a, **b;
 
-                if (boot_config_has_entry(config, *i))
+                existing = boot_config_find_entry(config, *i);
+                if (existing) {
+                        existing->reported_by_loader = true;
                         continue;
+                }
 
                 if (only_auto && !startswith(*i, "auto-"))
                         continue;
@@ -862,10 +866,11 @@ int boot_entries_augment_from_loader(
                         return log_oom();
 
                 config->entries[config->n_entries++] = (BootEntry) {
-                        .type = BOOT_ENTRY_LOADER,
+                        .type = startswith(*i, "auto-") ? BOOT_ENTRY_LOADER_AUTO : BOOT_ENTRY_LOADER,
                         .id = TAKE_PTR(c),
                         .title = TAKE_PTR(t),
                         .path = TAKE_PTR(p),
+                        .reported_by_loader = true,
                 };
         }