Remove installation date from installation details #1607

Job	Run time
check	54s
test	12m 13s
audit	20s
rustfmt	7s
clippy	1m 3s
cross-armv7	51s
cross-aarch64	51s
integration-test-five-nodes	13m 46s
integration-test-debts	17m 17s
integration-test-althea-payment	16m 45s
integration-test-eth-payments	13m 50s
integration-test-db-migration	12m 25s
integration-test-multi-exit	12m 42s
integration-test-validate-contract	12m 22s
	1h 55m 26s

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