CNAME-only should not be returned instantly in parellel requests

### 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

GitHub releases or script from README

### Setup

On one machine

### AdGuard Home version

v0.107.71

### Action

```sh
dig www.mydomain.com
```

2 upstream servers are queried in parellel.

### Expected result

one upstream would sometimes return an answer only with CNAME but without A record, this should be treated as a negative answer, ADH should wait for all answers.

;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58017
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 1232
;; QUESTION SECTION:
;www.xyz.com. IN A

;; ANSWER SECTION:
www.xyz.com. 600 IN CNAME www.xyz.com.w.abc.com.
www.xyz.com.w.abc.com. 600 IN A 111.222.333.444

;; Query time: 4 msec

### Actual result

ADH returned and cached the fastest answer, did not check whether the slightly slower answer included a valid A record.

;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62479
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 1232
;; QUESTION SECTION:
;www.xyz.com. IN A

;; ANSWER SECTION:
www.xyz.com. 600 IN CNAME www.xyz.com.w.abc.com.

;; Query time: 4 msec

### Additional information and/or screenshots

_No response_