common: reintroduce "ignored" primary tag.

Prior to 23.05, we used this tag to mark onchain to-self inputs we didn't
wait for (because they were too small).  This fixes migration if that happened
(and we are debating whether we should re-introduce this!).

```
lightningd: FATAL SIGNAL 6 (version v25.09rc2)                      
0x100c8683 send_backtrace                                           
        common/daemon.c:33                                          
0x100c876f crashdump                                                
        common/daemon.c:78                                          
0x7fffb2080493 ???                                                  
        ???:0                                                       
0x7fffb1ab0cac ???                                                  
        __pthread_kill_implementation+0x1bc:0
0x7fffb1a48a5b ???                                                  
        __GI_raise+0x2b:0                                           
0x7fffb1a2a3db ???                                                  
        __GI_abort+0x153:0                                          
0x100935b7 migrate_from_account_db
        wallet/account_migration.c:424
0x10093ff7 db_migrate                                               
        wallet/db.c:1139                                            
0x10096763 db_setup                                                 
        wallet/db.c:1185                                            
0x100a1bcb wallet_new                                               
        wallet/wallet.c:223                                         
0x1004485f main                                                     
        lightningd/lightningd.c:1311
0x7fffb1a2aba3 ???                                                  
        __libc_start_call_main+0x93:0
0x7fffb1a2adeb ???                                                  
        __libc_start_main_alias_1+0x1ab:0
0xffffffffffffffff ???                                              
        ???:0                                                       
lightningd: Died with signal 6                                  
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Fixes: https://github.com/ElementsProject/lightning/issues/8484

common/coin_mvt.c

@@ -36,6 +36,7 @@ static const char *mvt_tags[] = {
 	"penalty_adj",
 	"journal_entry",
 	"foreign",
+	"ignored",
 };
 
 #define PRIMARY_TAG_BITS ((1ULL << MVT_DEPOSIT) |	\
@@ -59,7 +60,8 @@ static const char *mvt_tags[] = {
 			  (1ULL << MVT_LEASE_FEE) |	\
 			  (1ULL << MVT_PENALTY_ADJ) |	\
 			  (1ULL << MVT_JOURNAL) |	\
-			  (1ULL << MVT_CHANNEL_PROPOSED))
+			  (1ULL << MVT_CHANNEL_PROPOSED) | \
+			  (1ULL << MVT_IGNORED))
 
 static enum mvt_tag mvt_tag_in_db(enum mvt_tag mvt_tag)
 {
@@ -145,6 +147,9 @@ static enum mvt_tag mvt_tag_in_db(enum mvt_tag mvt_tag)
 	case MVT_FOREIGN:
 		BUILD_ASSERT(MVT_FOREIGN == 26);
 		return mvt_tag;
+	case MVT_IGNORED:
+		BUILD_ASSERT(MVT_IGNORED == 27);
+		return mvt_tag;
 	}
 	abort();
 }

common/coin_mvt.h

@@ -40,7 +40,8 @@ enum mvt_tag {
 	MVT_PENALTY_ADJ = 24,
 	MVT_JOURNAL = 25,
 	MVT_FOREIGN = 26,
-#define NUM_MVT_TAGS (MVT_FOREIGN + 1)
+	MVT_IGNORED = 27,
+#define NUM_MVT_TAGS (MVT_IGNORED + 1)
 };
 
 struct mvt_tags {

common/test/run-coin_mvt.c

@@ -186,6 +186,8 @@ static bool mvt_tag_is_primary(enum mvt_tag tag)
 		return true;
 	case MVT_FOREIGN:
 		return false;
+	case MVT_IGNORED:
+		return true;
 	}
 	abort();
 }

contrib/msggen/msggen/schema.json

@@ -16666,6 +16666,7 @@
                     "to_them",
                     "penalized",
                     "stolen",
+                    "ignored",
                     "to_miner"
                   ],
                   "description": [

doc/schemas/listchainmoves.json

@@ -114,6 +114,7 @@
                 "to_them",
                 "penalized",
                 "stolen",
+                "ignored",
                 "to_miner"
               ],
               "description": [

plugins/bkpr/account.c

@@ -218,6 +218,7 @@ void maybe_update_account(struct command *cmd,
 			case MVT_PENALTY_ADJ:
 			case MVT_JOURNAL:
 			case MVT_FOREIGN:
+			case MVT_IGNORED:
 				/* Ignored */
 				break;
 		}