tests : Add unit tests for Alert class

[Ayoub-Mabrouk]

This PR adds comprehensive unit tests for the Alert class, covering:

• LogData interface implementation
• Level constant verification (550)
• Independence from channel, context, and message
• Consistency across multiple calls

[gmazzap]

Thak you for you work.

The code is ok. I would not consider this particular super-helpful as it only tests something that is quite hardcoded in the code.

Also, not sure why of all the Data implemntations, only "Alert" recived the tests.

Finally, the tests could be cleaner using data providers.

However, what stops me from merging is the failed actions.