use low spec.interval for Kustomizations and HelmReleases

Thomas Morinrequested to merge
flux-short-interval into main

This MR is needed for sylva-projects/sylva-core!4306 (merged), but it can merge anytime (merging it without sylva-projects/sylva-core!4306 (merged) will not break anything).

Edited by Thomas Morin

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