Add aggregation cost conservation test

[Noah-Philip]

Description

Adds an allocation aggregation cost conservation test.

The test queries the same completed historical window across multiple aggregation levels:

• cluster
• node
• namespace
• pod
• container

It sums totalCost for each aggregation and verifies that each total matches the cluster total within a documented absolute-or-relative tolerance.

Implementation

• Uses the same query parameters for every aggregation
• Uses yesterday to avoid live-window drift between sequential requests
• Includes idle cost separately with includeIdle=true
• Avoids redistributing idle with shareIdle=false
• Uses cluster aggregation as the comparison baseline
• Allows small differences from rounding and floating-point accumulation
• Failure output reports the divergent aggregation, cluster total, aggregation total, absolute difference, and relative difference

Testing

Using demo cluster:

• go test -count=1 ./test/integration/api/allocation -run TestAllocationCostConservedAcrossAggregations -v
• bats test/integration/api/allocation/test.bats

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR adds a new integration test that validates cost conservation across different aggregation levels in the allocation API. It ensures that querying the same historical window with different aggregations (cluster, node, namespace, pod, container) yields consistent total costs within a defined tolerance.

Changes:

• Added a new Go test file that queries the allocation API at multiple aggregation levels and compares their total costs against the cluster-level baseline.
• Registered the new test in the bats test runner.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
test/integration/api/allocation/test.bats	Adds a new bats entry to run the aggregation cost conservation test.
test/integration/api/allocation/aggregation_cost_conservation_test.go	New test that fetches allocation totals for multiple aggregation levels and asserts they match the cluster total within tolerance.

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