Retry failed private rDNS before cache expiry

### Prerequisites

- [x] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) and found no answer

- [x] I have searched other issues and found no duplicates

- [x] I want to report a bug and not [ask a question or ask for help](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a)

- [x] I have set up AdGuard Home correctly and [configured clients to use it](https://github.com/AdguardTeam/AdGuardHome/wiki/Clients). (Use the [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) for help with installing and configuring clients.)

### Platform (OS and CPU architecture)

Linux, AMD64 (aka x86_64)

### Installation

Docker

### Setup

On one machine

### AdGuard Home version

v0.107.59

### Action

1. Set up coredns docker container address as Private reverse DNS server
2. Start both adguard and coredns at the same time (using docker-compose)

### Expected result

I would expect adguard home to re-try using Private reverse DNS server after failure, rather than trying once and then disregarding it forever until restart.

### Actual result

Adguard home probably tries to contact Private reverse DNS server after start, it fails because coredns instance is still not ready to serve, then it continues to ignore it completely, unless adguard home is restarted, or Private reverse DNS server entry is re-done and saved again.

### Additional information and/or screenshots

docker-compose

```
version: '4'

x-defaults: &defaults
restart: always
mem_swappiness: "1"
security_opt:
- no-new-privileges:true

services:
adguard:
<<: *defaults
image: adguard/adguardhome
container_name: adguard
network_mode: host
environment:
- TZ=Europe/Amsterdam
labels:
- traefik.enable=true
- traefik.http.services.adguard.loadbalancer.server.port=3000
- traefik.http.routers.adguard.rule=Host(`adguard.${TRAEFIK_DOMAIN}`)
- traefik.http.routers.adguard.entrypoints=websecure
- traefik.http.routers.adguard.middlewares=internal@file
volumes:
- /volume1/docker/adguard/conf:/opt/adguardhome/conf
- /volume1/docker/adguard/work:/opt/adguardhome/work
mem_limit: 700m
memswap_limit: 700m

coredns:
<<: *defaults
image: ghcr.io/dougbw/coredns_omada@sha256:f95d7d342bdd82c2625a4c9313ae83d0a79db917501ba878e15b50b82b1f9b09
container_name: coredns
ports:
- 127.0.0.1:5053:53/udp
environment:
- TZ=Europe/Amsterdam
- OMADA_URL=https://${SERVER_LAN_IP}:8043
- OMADA_SITE=Default
- OMADA_USERNAME=${OMADA_USERNAME}
- OMADA_PASSWORD=${OMADA_PASSWORD}
- OMADA_DISABLE_HTTPS_VERIFICATION=true
volumes:
- /volume1/docker/coredns/Corefile:/Corefile
mem_limit: 100m
memswap_limit: 100m
```