Bug 40059: Use MOZ_BUILD_DATE for versionCode

At the same time we adapt MOZ_BUILD_DATE to our needs where it is
actually used and not in tor-browser-build. This gives us more
flexibility. See: tor-browser-build#40084.
2 jobs for bug_40059 in 20 minutes and 23 seconds (queued for 3 minutes and 14 seconds)
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