[loadtest] Modernize & fix Sub.py #4982

Job	Run time
Build monitoring image	1m 27s
Repository hygiene	2m 29s
Unit tests	3m 14s
uss_qualifier configurations.dev.generate_rid_test_data tests / uss_qualifier-generate_rid_test_data-test test	1m 44s
mock_uss tests / mock_uss test	38s
uss_qualifier configurations.dev.uspace tests / uss_qualifier-uspace-test test	10m 9s
uss_qualifier configurations.dev.geoawareness_cis tests / uss_qualifier-geoawareness_cis-test test	1m 52s
uss_qualifier configurations.dev.dss_probing tests / uss_qualifier-dss_probing-test test	4m 41s
uss_qualifier configurations.dev.noop tests / uss_qualifier-noop-test test	2m 9s
uss_qualifier configurations.dev.message_signing tests / uss_qualifier-message_signing-test test	2m 35s
uss_qualifier configurations.dev.general_flight_auth tests / uss_qualifier-general_flight_auth-test test	1m 45s
uss_qualifier configurations.dev.netrid_v19 tests / uss_qualifier-netrid_v19-test test	9m 1s
uss_qualifier configurations.dev.minimal_probing tests / uss_qualifier-minimal_probing-test test	2m 19s
uss_qualifier configurations.dev.utm_implementation_us tests / uss_qualifier-utm_implementation_us-test test	3m 24s
prober tests / prober test	1m 39s
uss_qualifier configurations.dev.netrid_v22a tests / uss_qualifier-netrid_v22a-test test	8m 58s
uss_qualifier configurations.dev.f3548_self_contained tests / uss_qualifier-f3548_self_contained-test test	3m 11s
uss_qualifier configurations.dev.geospatial_comprehension tests / uss_qualifier-geospatial_comprehension-test test	1m 52s
Publish GitHub Pages	20s
	1h 3m 27s

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