terraform: update AWS LB permissions

[msanft]

Context

AWS updated the permissions necessary for the aws-load-balancer-controller, which resulted in a failing LB E2E test for us, as well as the general symptom of AWS LBs not working.

Fixes https://github.com/edgelesssys/issues/issues/1300

Proposed change(s)

• Update the permissions to incorporate the new requirements.
• Update the docs to mention that an IAM migration is necessary.

Additional info

• AB#5361
• LB E2E Test (post-fix)

IAM Upgrade tested manually via:

git checkout f66c03e0c8c63163794264a1d7b96ebf56f36cc9
bazel run //:devbuild --cli_edition=enterprise
# constellation apply, ...
kubectl apply -f .github/actions/e2e_lb/ns.yml && kubectl apply -f .github/actions/e2e_lb/lb.yml
bazel run --test_timeout=14400 //e2e/internal/lb:lb_test
# verify failure
kubectl delete -f .github/actions/e2e_lb/ns.yml && kubectl delete -f .github/actions/e2e_lb/lb.yml
git checkout b49b909c058f187e5b96277b52b5d1f38028301b
bazel run //:devbuild --cli_edition=enterprise
# constellation apply, ...
kubectl apply -f .github/actions/e2e_lb/ns.yml && kubectl apply -f .github/actions/e2e_lb/lb.yml
bazel run --test_timeout=14400 //e2e/internal/lb:lb_test
# verify success

Checklist

• Run the E2E tests that are relevant to this PR's changes
• Update docs
• Add labels (e.g., for changelog category)
• Is PR title adequate for changelog?
• Link to Milestone

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