Add build date to dropdown

[darricheng]

Addresses #1740.

Would adding a link to the builds page make sense?
E.g. https://docs.rs/crate/jiff/0.2.28/builds

[GuillaumeGomez]

Please update the screenshot now.

[darricheng]

@GuillaumeGomez updated the PR description. The GUI test failed in the previous commit, which seems to be because we added a new row to that topbar section. I'm not familiar enough with the testing method though, e.g. what page the testing framework is using to run the tests. Is it just a matter of bumping the count from 3 to 4 in this case?

gui-tests/crate-topbar-dropdown-menu.goml

store-value: (crate_main_info_items, ".package-details-menu > ul > .pure-menu-item")
// There should be 3 items.
assert-count: (|crate_main_info_items|, 3)

[GuillaumeGomez]

Ah yes, since you added a new row, you need to increase the number to 4. If you want more info about browser-ui-test (the framework we use for the GUI tests): https://github.com/GuillaumeGomez/browser-UI-test/blob/main/goml-script.md

[GuillaumeGomez]

Thanks!