Fix mixed ASG capacity double counting

[Cool-fire]

This change adds a single EC2 ASG capacity-counting path that deduplicates instances by instance ID and only counts serving lifecycle states. That prevents mixed on-demand/spot groups from overstating current capacity when the same spot instance is observed more than once.

What changed:

• add an Auto Scaling client interface in pkg/service/ec2.go so the EC2 service can be tested around ASG describe/update behavior
• add countAutoScalingGroupCapacity to count unique, capacity-contributing instances exactly once
• add focused regression tests for mixed on-demand/spot ASGs and for ignoring non-serving lifecycle states

Verification:

• attempted make
• result: failed in the sandbox because the Go toolchain is not installed (/bin/sh: 1: go: not found)

Limitations:

• I could not run go test or build the binary in this environment because go is unavailable.

Files changed

pkg/service/ec2.go      | 65 ++++++++++++++++++++++++++++++++++++++++++++++++-
 pkg/service/ec2_test.go | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 125 insertions(+), 1 deletion(-)

Session

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