Patryk Osmaczko be8b270023 fix(chat/messages): ensure there is only one label for given date
Covers the case, where timestamps are missynchronized:
```
clock: 0 timestamp: 31.12.2022 10:00:00
clock: 1 timestamp: 01.01.2023 23:59:30
clock: 2 timestamp: 01.01.2023 23:59:45
clock: 3 timestamp: 02.01.2023 00:00:05
clock: 4 timestamp: 02.01.2023 00:00:10
clock: 5 timestamp: 01.01.2023 23:59:55
```

Before, it would result in repeated labels:
```
clock: 0 timestamp: 31.12.2022 10:00:00
    LABEL: 1.01.2023
clock: 1 timestamp: 01.01.2023 23:59:30
clock: 2 timestamp: 01.01.2023 23:59:45
    LABEL: 2.01.2023
clock: 3 timestamp: 02.01.2023 00:00:05
clock: 4 timestamp: 02.01.2023 00:00:10
    LABEL: 1.01.2023
clock: 5 timestamp: 01.01.2023 23:59:55
```

fixes: #8962
2023-01-17 16:21:25 +01:00
2022-10-19 17:34:23 +02:00
2022-03-10 14:12:11 -04:00
2022-03-11 15:52:47 -05:00
2022-07-14 22:04:33 +02:00
2020-06-08 13:07:25 -04:00
2022-12-05 21:03:03 +01:00
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