Multi-Runner config should support additional security groups for each config

[darklab-sh]

We are currently using the multi-runner module but when specifying the runner_additional_security_group_ids input within the multi_runner_config block, it is ignored. It has to be specified outside the multi_runner_config block, which means all runner configs will receive the same additional security groups.

In our use-case, we need to specify different security groups for each config. Should this not be the expected behavior?

[npalm]

Feel free to propose a PR, please take some care to keep the PR backwards compatible

[darklab-sh]

PR submitted: #3221
Feedback welcome!

[github-actions]

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