Add critical test cases for date-time formatting

[coderabbitai]

As discussed in PR #1, additional test cases are needed to improve coverage for date-time formatting. This includes adding tests for:
ovos_date_parser/res/ru-ru/date_time_test.json

1. Midnight (00:00) and noon (12:00)
2. AM times
3. Minute boundaries

Reference comment: #1 (comment)

Requester: @JarbasAl