refactor(api): Remove concurrency from `LegacyContextPlugin` (#16098) #18998

Job	Run time
opentrons package linting	2m 45s
opentrons package tests on windows-2022, python 3.10	5m 20s
opentrons package tests on ubuntu-22.04, python 3.10	4m 42s
opentrons package tests on ubuntu-22.04, python 3.10	3m 26s
opentrons package tests on macos-latest, python 3.10	3m 13s
deploy opentrons package	1m 29s
	20m 55s

Provide feedback