Filter before matching SLIs to allow for duplicate SLI names.

Resolves gitlab-com/gl-infra/scalability#1620 (closed).

Currently, the error budget detail dashboard for package is missing two SLIs, one for load balancer and one for server. This is because the jsonnet for this dashboard currently creates an object using object.fromPairs that removes any duplicates, and thus is matching only the first server entry.

This MR changes that to filter out the correct SLIs for the stage group first, which allows for duplicates.

Spot testing across multiple different dashboards shows that this works correctly, but it's a fairly significant change that is likely going to cause SLIs to show up in several places that weren't there before, so happy for additional feedback.

Although I suspect these won't still be valid by the time anyone looks at this...

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