TC_ACE_1_6 (#43731)

* [WIP] Test plan impl

* Restyled by ruff

* Restyled by autopep8

* minor update

* Restyled by ruff

* Fix step ordering errors

* test runs w/ groupcast, needs cleanup

* Restyled by autopep8

* Restyled by isort

* lint error

* Cleanup, still some todo's remaining

* Restyled by ruff

* Restyled by autopep8

* Support iana and per group, fix legacy groups flow

* Add run without groupcast and pics update

* Remove old yaml version of test

* Restyled by ruff

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Co-authored-by: Restyled.io <commits@restyled.io>

Author: zaid-google