Tests of in-place upgrades to 7.x #165

Job	Run time
build	1m 28s
compute-versions	10s
test-inplace	3h 4m 15s
test (6.9+77bc1f3, https://packages.geldata.com/archive/x86_64-unknown-linux-gnu/gel-server-6.9+7...	18m 45s
test (6.0+4a229ae, https://packages.geldata.com/archive/x86_64-unknown-linux-gnu/gel-server-6.0+4...	11m 35s
test (6.10+b9cb801, https://packages.geldata.com/archive/x86_64-unknown-linux-gnu/gel-server-6.10...	11m 44s
test-inplace (--rollback-and-test)	2h 58m 50s
test-inplace (--rollback-and-reapply, -k test_link_on_target_delete -k test_edgeql_select -k test...	2m 34s
Notify in Slack on failures	3s
	6h 49m 24s

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