Merged PR 278: Enable the red agent to vary its start node

## Summary
- Made the data manipulation red agent be able to choose between the two clients to start operating on
- changed the attacker name in the config to 'data_manipulation_attacker' to because it is no longer tied to any client
- Updated the documentation notebook accordingly.
- Fixed a bug where the database client made a new connection every time it sent a SQL query (it tries to reuse its most recent one instead)
- Fixed a bug where link loads were not being cleared between episodes (?)

**warning** - the green agents are not working properly after reset right now, but I'm gonna fix this in the next ticket where I refactor episode reset.

## Test process
- unit tests pass
- UC2 notebook passes with both clients. (currently this doesn't work after an episode reset, but the very next thing I'm gonna work on is refactoring the reset, so I don't want to waste time fixing this.)

## 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
- [ ] 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
- [n] attended to any **TO-DOs** left in the code

Related work items: #2232

src/primaite/config/_package_data/example_config.yaml

@@ -85,7 +85,7 @@ agents:
 
 
 
-  - ref: client_1_data_manipulation_red_bot
+  - ref: data_manipulation_attacker
     team: RED
     type: RedDatabaseCorruptingAgent
 
@@ -106,6 +106,9 @@ agents:
         - node_name: client_1
           applications:
             - application_name: DataManipulationBot
+        - node_name: client_2
+          applications:
+            - application_name: DataManipulationBot
         max_folders_per_node: 1
         max_files_per_folder: 1
         max_services_per_node: 1
@@ -730,6 +733,13 @@ simulation:
         type: WebBrowser
         options:
           target_url: http://arcd.com/users/
+      - ref: data_manipulation_bot
+        type: DataManipulationBot
+        options:
+          port_scan_p_of_success: 0.8
+          data_manipulation_p_of_success: 0.8
+          payload: "DELETE"
+          server_ip: 192.168.1.14
       services:
       - ref: client_2_dns_client
         type: DNSClient

src/primaite/config/_package_data/example_config_2_rl_agents.yaml

@@ -54,7 +54,7 @@ agents:
         frequency: 4
         variance: 3
 
-  - ref: client_1_data_manipulation_red_bot
+  - ref: data_manipulation_attacker
     team: RED
     type: RedDatabaseCorruptingAgent
 
@@ -74,7 +74,10 @@ agents:
         nodes:
         - node_ref: client_1
           applications:
-            - application_ref: data_manipulation_bot
+            - application_name: DataManipulationBot
+        - node_name: client_2
+          applications:
+            - application_name: DataManipulationBot
         max_folders_per_node: 1
         max_files_per_folder: 1
         max_services_per_node: 1