refactor: manipulate entire context instead of TestSetXXX #13479

Job	Run time
gno2go (1.22.x)	50s
lint (1.22.x)	44s
mod-tidy (1.22.x)	2m 24s
test (1.22.x)	1m 11s
Run gno fmt on examples / fmt	38s
Check generated files are up to date / generated	11s
	5m 58s

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