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ARROW-12442: [CI] Set job timeouts on GitHub Actions

The default job timeout on Github Actions is 6 hours (360 minutes).

All our jobs normally take much less than that (typically less than 30 minutes for most jobs), but external conditions such as network timeouts may make some jobs take the whole 6 hours before being killed. This in turn prevents other jobs from starting and makes the build queue grow excessively. Also, since build resources on Github Actions are shared between all Apache projects, this impacts other Apache projects as well.

Set a reasonable timeout on most jobs to minimize the repercussion of network issues and such.

Closes #10129 from pitrou/ARROW-12442-gha-timeouts

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>