Zoekt: Resource usage/cost optimizations
## Background We've done some optimization work and now can adjust requests/limits for Zoekt k8s pods ## Proposal We should make our resource/limits in line with the actual usage. <!-- Use this section to explain the feature and how it will work. It can be helpful to add technical details, design proposals, and links to related epics or issues. --> <!-- Please add a label for the type of maintenance as per https://handbook.gitlab.com/handbook/product/groups/product-analysis/engineering/metrics/#work-type-classification -->
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