bug: Nodepool stack needs to use the nodepool logical name

[davidmccormick]

Found an issue where the network and nodepool stacks are using not using the same name for the worker arn. Correct by using santized name for both.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To fully approve this pull request, please assign additional approvers.
We suggest the following additional approver: c-knowles

If they are not already assigned, you can assign the PR to them by writing /assign @c-knowles in a comment when ready.

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov-io]

Codecov Report

Merging #1515 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1515   +/-   ##
=======================================
  Coverage   25.46%   25.46%           
=======================================
  Files          97       97           
  Lines        5003     5003           
=======================================
  Hits         1274     1274           
  Misses       3582     3582           
  Partials      147      147

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b62da15...00e15f9. Read the comment docs.