Remove installation date from installation details #1618

Job	Run time
check	20s
test	1m 35s
clippy	34s
audit	25s
rustfmt	5s
cross-armv7	36s
integration-test-five-nodes	14m 16s
cross-aarch64	47s
integration-test-db-migration	13m 24s
integration-test-eth-payments	14m 16s
integration-test-debts	17m 18s
integration-test-althea-payment	16m 27s
integration-test-multi-exit	12m 54s
integration-test-validate-contract	12m 37s
	1h 45m 34s

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