ACADynamicSessionsCodeExecutor: allow suppressing the code execution result

[stuartleeks]

When using the ACADynamicSessionsCodeExecutor it includes the stdout from the execution but also the results property from the call to dynamic sessions. When the executed code results in a file being saved this is included in the result:

Plot saved as 'results_by_date.png'
{'type': 'image', 'format': 'png', 'base64_data': 'iVBORw0KGgoAAAANSUhEUgAAA90AAAJOCAYAAACqS2TfAAAAOXRFWHRTb2Z0d2FyZQ...

In some situations, this additional output is not desirable:

• when displaying the code output to a user - in this case, the stdout content is dwarfed by the base64 encoded file content
• when an LLM agent is going to evaluate the code output to determine next steps - in this case, the base64 content will be included in the message history sent to the LLM increasing the prompt token cost

To handle these cases, I'm proposing adding a new (optional) argument to the ACADynamicSessionsCodeExecutor constructor that would allow suppressing the result content (but default to False to preserve the current behaviour in the default case)

[ekzhu]

Thanks!