store_screenshots: drop the graph-margin repair, untrack the pycache #38

Job	Run time
network-fixtures	6m 25s
view-and-chrome-suites (chrome, phone)	10m 39s
experiments-e2e (1/2)	9m 17s
experiments-e2e (2/2)	9m 42s
view-and-chrome-suites (translations, phone)	9m 24s
remote-contract	5m 14s
view-and-chrome-suites (chrome, tablet)	9m 26s
view-and-chrome-suites (translations, tablet)	8m 11s
	1h 8m 18s

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