Reduce nightly build cadence (#64557)

Reduce the nightly release workflow from six runs per day to two runs
per day, at 02:00 and 14:00 UTC. Update both the workflow generator and
generated workflow.

Validated by regenerating workflows with `cargo xtask workflows`.

Release Notes:

- N/A

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Co-authored-by: Amp <amp@ampcode.com>
b3f5de1fd1Piotr Osiewicz committed on 9/21/2026, 5:23:07 PM· committed by GitHubparenta49db37
2 files changedLine totals unavailable