Refactor galaxy.files plugin loading + config handling. #26632

Job	Run time
build-client / build-client	11m 24s
setup-selenium / setup_chromedriver	5s
Test (3.8, 0)	41m 46s
Test (3.8, 1)	52m 47s
Test (3.8, 2)	48m 53s
	2h 34m 55s

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