Log assertions: add assertions for log errors in HTTP tracker

[josecelano]

Parent issue: #1150

test servers::http::v1::contract::configured_as_whitelisted::and_receiving_an_announce_request::should_fail_if_the_torrent_is_not_in_the_whitelist ... 2024-12-23T18:46:14.180931Z ERROR torrust_tracker::core: error=The torrent: 9c38422213e30bff212b30c360d26f9a02136422, is not whitelisted, src/core/mod.rs:1108:23
test servers::http::v1::contract::configured_as_whitelisted::receiving_an_scrape_request::should_return_the_zeroed_file_when_the_requested_file_is_not_whitelisted ... 2024-12-23T18:46:14.209989Z ERROR torrust_tracker::core: error=The torrent: 9c38422213e30bff212b30c360d26f9a02136422, is not whitelisted, src/core/mod.rs:1108:23

You can run a single test with:

cargo test -- --nocapture servers::http::v1::contract::configured_as_whitelisted::and_receiving_an_announce_request::should_fail_if_the_torrent_is_not_in_the_whitelist

The output:

2024-12-26T11:48:17.599803Z ERROR torrust_tracker::core: error=The torrent: 9c38422213e30bff212b30c360d26f9a02136422, is not whitelisted, src/core/mod.rs:1108:23
!! shuting down in 90 seconds !!
test servers::http::v1::contract::configured_as_whitelisted::and_receiving_an_announce_request::should_fail_if_the_torrent_is_not_in_the_whitelist ... ok