chore: sync with upstream kubernetes-sigs/karpenter main

[jeremywgleeson]

chore: sync with upstream kubernetes-sigs/karpenter main

Summary

Fast-forwards exa-labs/karpenter main to match upstream kubernetes-sigs/karpenter main. Brings in 6 upstream commits:

• feat: add a nodepool cost metric 2 (#2847) — new ClusterCost tracker in pkg/controllers/state/informer/cost/ with per-nodepool and cluster-wide cost metrics
• docs(rfc): add grace period support for do-not-disrupt pod annotation (#2656) — design doc for time-limited karpenter.sh/do-not-disrupt values (e.g. "4h")
• chore: show nodepools when showing disruption commands (#2862)
• chore: add minDrainTime (#2709)
• chore: bump go to 1.26.1 (#2904)
• chore(deps): bump golang.org/x/text from 0.33.0 to 0.34.0 (#2845)

No exa-specific code on main was modified — origin/main was a direct ancestor of upstream/main, so this is a clean fast-forward.

Review & Testing Checklist for Human

• Verify the jeremy/rolling-restart-consolidation branch rebases cleanly onto this updated main (particularly pkg/controllers/disruption/types.go and pkg/controllers/state/statenode.go which are touched by both the cost metric feature and rolling restart)
• Confirm Go 1.26.1 bump is compatible with the monorepo's karpenter.yaml build workflow (currently uses go-version: "1.22" — may need updating)
• Spot-check that the karpenter-provider-aws fork's go.mod replace directive (replace sigs.k8s.io/karpenter => ../base) still resolves after this update

Notes

• Requested by: @jeremywgleeson
• Devin Session
• Next steps after merge: rebase rolling restart branch, sync provider-aws fork, update monorepo submodules

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[coveralls]

Pull Request Test Coverage Report for Build 23100449680

Details

• 225 of 324 (69.44%) changed or added relevant lines in 9 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 80.268%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controllers/state/informer/nodeclaim.go	4	8	50.0%
pkg/controllers/controllers.go	0	5	0.0%
pkg/controllers/state/informer/nodepool.go	6	13	46.15%
pkg/controllers/state/informer/pricing.go	18	59	30.51%
pkg/state/cost/cost.go	170	212	80.19%

Files with Coverage Reduction	New Missed Lines	%
pkg/controllers/state/informer/nodepool.go	1	60.0%

Totals
Change from base Build 22327604045:	-0.2%
Covered Lines:	12078
Relevant Lines:	15047

---

💛 - Coveralls