CLIENT PAUSE - don't drop together with other blocked clients (#8302)

When the server state changes and blocked clients are being dropped, the
paused clients should not be dropped, they're safe to keep since unlike
other blocked types, these commands are not half way though processing,
and the commands they sent may get rejected according to the new server
state.

src/blocked.c

@@ -214,6 +214,13 @@ void disconnectAllBlockedClients(void) {
         client *c = listNodeValue(ln);
 
         if (c->flags & CLIENT_BLOCKED) {
+            /* PAUSED clients are an exception, when they'll be unblocked, the
+             * command processing will start from scratch, and the command will
+             * be either executed or rejected. (unlike LIST blocked clients for
+             * which the command is already in progress in a way. */
+            if (c->btype == BLOCKED_PAUSE)
+                continue;
+
             addReplyError(c,
                 "-UNBLOCKED force unblock from blocking operation, "
                 "instance state changed (master -> replica?)");