Allow overriding the build timeout in build nodes

Currently, there is an established timeout for building packages. At this moment, this is tied to the platform data as you can see [here](https://github.com/AlmaLinux/albs-node/blob/28648cbfafedd4090a2352d6984c5aef90382308/build_node/builders/base_builder.py#L365-L374), which makes sense. In general this approach is fine, however, sometimes:
* We have a slow build node and the platform's default timeout is not enough
* There is a package that takes a considerable amount of time to build in a particular architecture

it would be great to be able to increase the build timeout in specific situations as mentioned below.
Initially, I'd say that we can bring support to set a custom build timeout at build node level.

Also, we can think about adding some more fine-grained control, like, "we want to set a custom build timeout for a specific package only and in this build node", but this implementation could take us some time. For that reason, I'd keep this out of the scope for now and create a new ticket describing the full proposed solution if we find that we really need it.