Add input validation to modification workflows that contain GA- and GS-IDs

gso/services/subscriptions.py

gso/workflows/edge_port/modify_edge_port.py

gso/workflows/iptrunk/create_imported_iptrunk.py

gso/workflows/iptrunk/create_iptrunk.py

gso/workflows/iptrunk/migrate_iptrunk.py

gso/workflows/iptrunk/modify_trunk_interface.py

gso/workflows/l2_circuit/create_imported_layer_2_circuit.py

...kflows/l3_core_service/create_imported_l3_core_service.py

test/workflows/edge_port/test_modify_edge_port.py

test/workflows/iptrunk/test_create_iptrunk.py

test/workflows/iptrunk/test_modify_trunk_interface.py