`modify_vrf_router_list`: Added LSO steps

requested review from @karel.vanklink

assigned to @Aleksandr.Kurbatov

@karel.vanklink I need your help with unit tests.

Some minor edits, and make sure to update the associated unit test since this workflow now contains two LSO interactions that need to be accounted for.

added 39 commits

• 7d270b89...8e080399 - 37 commits from branch develop
• e8614e72 - `modify_vrf_router_list`: Added LSO steps
• 2ba605cc - Update unit test for VRF router list modification workflow

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merged