Merged PR 458: Carry over airspace hotfixes from internal

## Summary
Carried over hit fixes from internal that backtracked on the complex channel width stuff for now and focussed on getting a stable data rate baked in for each frequency.  Implemented overriding of frequency max capacities on the airspace. updated documentation to reflect the changes in airspace.py.

## Test process
- Original tests still work
- Tested reading the frequency capacity overrides from config file
- Tested that setting the frequency override to 0.0 blocks the channel

## 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
- [X] 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: #2745

tests/assets/configs/wireless_wan_network_config.yaml

@@ -9,8 +9,6 @@ game:
 
 simulation:
   network:
-    airspace:
-      airspace_environment_type: urban
     nodes:
       - type: computer
         hostname: pc_a

tests/assets/configs/wireless_wan_network_config_freq_max_override.yaml

@@ -10,7 +10,9 @@ game:
 simulation:
   network:
     airspace:
-      airspace_environment_type: urban
+      frequency_max_capacity_mbps:
+        WIFI_2_4: 123.45
+        WIFI_5: 0.0
     nodes:
       - type: computer
         hostname: pc_a
@@ -37,8 +39,7 @@ simulation:
         wireless_access_point:
           ip_address: 192.168.1.1
           subnet_mask: 255.255.255.0
-          frequency: WIFI_5
-          channel_width: 80
+          frequency: WIFI_2_4
         acl:
           1:
             action: PERMIT
@@ -59,8 +60,7 @@ simulation:
         wireless_access_point:
           ip_address: 192.168.1.2
           subnet_mask: 255.255.255.0
-          frequency: WIFI_5
-          channel_width: 80
+          frequency: WIFI_2_4
         acl:
           1:
             action: PERMIT

tests/assets/configs/wireless_wan_network_config_freq_max_override_blocked.yaml

@@ -10,7 +10,9 @@ game:
 simulation:
   network:
     airspace:
-      airspace_environment_type: blocked
+      frequency_max_capacity_mbps:
+        WIFI_2_4: 0.0
+        WIFI_5: 0.0
     nodes:
       - type: computer
         hostname: pc_a
@@ -37,8 +39,7 @@ simulation:
         wireless_access_point:
           ip_address: 192.168.1.1
           subnet_mask: 255.255.255.0
-          frequency: WIFI_5
-          channel_width: 80
+          frequency: WIFI_2_4
         acl:
           1:
             action: PERMIT
@@ -59,8 +60,7 @@ simulation:
         wireless_access_point:
           ip_address: 192.168.1.2
           subnet_mask: 255.255.255.0
-          frequency: WIFI_5
-          channel_width: 80
+          frequency: WIFI_2_4
         acl:
           1:
             action: PERMIT