Few CI improvements witch will reduce occupation CI queue and eliminate
stale runs.
1. Kill CI jobs on PRs once PR branch gets a new push. This will prevent
situation happened today - a huge job triggered twice in less than an
hour and occupied all **org** (for all repositories) runners queue for
the rest of the day (see pic). This completely blocked valkey-glide
team.
2. Distribute nightly croned jobs on time to prevent them running
together. Keep in mind, cron's TZ is UTC, so midnight tasks incur
developers located in other timezones.
This must be backported to all release branches (`valkey-x.y` and `x.y`)
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Signed-off-by: Yury-Fridlyand <yury.fridlyand@improving.com>
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