Constant re_build_tools::EXPORT_BUILD_TIME_FOR_DEVELOPERS

pub(crate) const EXPORT_BUILD_TIME_FOR_DEVELOPERS: bool = false;

Should we export the build datetime for developers in the workspace?

It will be visible in analytics, in the viewer’s about-menu, and with rerun --version.

To do so accurately may incur unnecessary recompiles, so only turn this on if you really need it.