Fix legacy salmon and add experiment class for salmon #2685

Job	Run time
changes	2s
run / dryrunexperiments	2m 58s
run / dynamicdryrunexperiments	6m 11s
docs / build	1m 58s
license / verify-license	5s
run / saxpy	4m 4s
style / lint	11s
docs / deploy	0s
	15m 29s

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