CA: remove dead CreateNodeNameToInfoMap helper

[x13n]

The function has been unused since Feb 2020 (6 years), when the last usage in simulator/cluster.go was removed in PR #2890 (commit d11b396).

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

@x13n: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-autoscaling-e2e-ca-build	7ba6f71	link	false	/test pull-autoscaling-e2e-ca-build
pull-autoscaling-e2e-gci-gce-ca-test	7ba6f71	link	false	/test pull-autoscaling-e2e-gci-gce-ca-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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