ci: replace weekly_ci with periodic_ci, stagger schedules [citest_skip]

[richm]

Rename the weekly CI trigger workflow to periodic_ci. The name better
reflects that this is for recurring CI, not necessarily weekly.

Stagger the scheduled start times so that roles do not all compete for
the limited github action job capacity at once. The first role starts
Saturday 02:00 UTC, and each subsequent role starts one hour later, with
an extra hour after ha_cluster, snapshot, and storage because those tests
typically take longer.

Periodic CI is disabled by default. Set the repository or organization
variable ENABLED to true to enable it. We don't currently use it.
We may enable it in the future.

Signed-off-by: Rich Megginson rmeggins@redhat.com

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