Enable timestamps in CSCS CI output

[msimberg]

Adds a timestamp to every line of log output. The raw log has the full timestamp. See https://docs.gitlab.com/runner/configuration/feature-flags.html for details. This feature is only available for gitlab runners 16.11 and newer, which at the time of the PR is not all CSCS CI runners, but I'm enabling the flag globally anyway, so that when they're updated, we'll have the timestamps there.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.05% (target: -1.00%)	✅ ∅ (target: 90.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (f182d67)	18212	13736	75.42%
Head commit (19d41ac)	18212 (+0)	13746 (+10)	75.48% (+0.05%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1359)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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