Lift legacy UserToolSource representations on read #41735

Job	Run time
build-client / build-client	4m 4s
setup-selenium / setup_chromedriver	10s
Test (3.10, 1)	50m 50s
Test (3.10, 0)	49m 29s
Test (3.10, 2)	52m 44s
	2h 37m 17s

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