Merged PR 376: 2457 - Remove Hardcoding from Links

## Summary
This PR removes the hardcoding of Link bandwidth, and makes it possible to be configured via the network yaml definitions.
Link bandwidth will still default to 100 if this is not present, to prevent breaking all previous defined networks.

## Test process
All tests continue to pass.
`basic_network_config.yaml` now provides a non-default link bandwidth which is confirmed within unit tests.

## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [X] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [X] attended to any **TO-DOs** left in the code

Related work items: #2457

tests/integration_tests/configuration_file_parsing/nodes/test_node_config.py

@@ -43,3 +43,6 @@ def test_basic_config():
     # client 3 should not be online
     client_3: Computer = network.get_node_by_hostname("client_3")
     assert client_3.operating_state == NodeOperatingState.OFF
+
+    for link in network.links:
+        assert network.links[link].bandwidth == 200

tests/integration_tests/system/test_web_client_server_and_database.py

@@ -49,12 +49,12 @@ def web_client_web_server_database(example_network) -> Tuple[Network, Computer,
     db_server_nic = db_server.network_interfaces[next(iter(db_server.network_interfaces))]
 
     # Connect Computer and Server
-    link_computer_server = Link(endpoint_a=computer_nic, endpoint_b=server_nic)
+    link_computer_server = Link(endpoint_a=computer_nic, endpoint_b=server_nic, bandwidth=100)
     # Should be linked
     assert link_computer_server.is_up
 
     # Connect database server and web server
-    link_server_db = Link(endpoint_a=server_nic, endpoint_b=db_server_nic)
+    link_server_db = Link(endpoint_a=server_nic, endpoint_b=db_server_nic, bandwidth=100)
     # Should be linked
     assert link_computer_server.is_up
     assert link_server_db.is_up