perf: Remove calling List on NodeClaims and Nodes in interruption controller

[jonathan-innis]

Fixes #N/A

Description

This change removes the construction of the NodeClaim instanceID map and the Node instanceID map -- this was expensive to construct and was re-constructed on every requeue of the interruption controller. Rather than constructing the mapping this way, we can use a field indexer on instanceID and look-up the NodeClaim and Nodes add-hoc by performing a matchField list query against the internal read cache

How was this change tested?

make presubmit
/karpenter snapshot

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[netlify]

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[jonathan-innis]

/karpenter snapshot

[coveralls]

Pull Request Test Coverage Report for Build 13194826151

Details

• 30 of 64 (46.88%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 64.766%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controllers/interruption/controller.go	14	19	73.68%
pkg/test/environment.go	16	22	72.73%
pkg/operator/operator.go	0	23	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/controllers/interruption/controller.go	1	71.81%

Totals
Change from base Build 13194596684:	-0.2%
Covered Lines:	5803
Relevant Lines:	8960

---

💛 - Coveralls

[github-actions]

Snapshot successfully published to oci://021119463062.dkr.ecr.us-east-1.amazonaws.com/karpenter/snapshot/karpenter:0-2bca45548da778643a51a80971bd28ca1b8b3a54.
To install you must login to the ECR repo with an AWS account:

aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin 021119463062.dkr.ecr.us-east-1.amazonaws.com

helm upgrade --install karpenter oci://021119463062.dkr.ecr.us-east-1.amazonaws.com/karpenter/snapshot/karpenter --version "0-2bca45548da778643a51a80971bd28ca1b8b3a54" --namespace "kube-system" --create-namespace \
  --set "settings.clusterName=${CLUSTER_NAME}" \
  --set "settings.interruptionQueue=${CLUSTER_NAME}" \
  --set controller.resources.requests.cpu=1 \
  --set controller.resources.requests.memory=1Gi \
  --set controller.resources.limits.cpu=1 \
  --set controller.resources.limits.memory=1Gi \
  --wait

[jigisha620]

LGTM 🚀