Fix AKS node pool and node resource group validation

[mantis-toboggan-md]

Summary

Fixes #10462 #9433

Occurred changes and/or fixed issues

This PR fixes the validation used for AKS node and resource group names.

Technical notes summary

The previous regular expression used to validate resource group characters caused catastrophic backtracking https://www.regular-expressions.info/catastrophic.html

Areas or cases that should be tested

• resource group names containing invalid characters
• node pool names containing invalid characters/excessive length

Checklist

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• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
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[momesgin]

Tested and LGTM

Edit: one unit test needs an update:

describe('fx: clusterNameChars', () => {
  it.each([
      ['!!abc!!', MOCK_TRANSLATION],
      ['123aBc-_', undefined]] // This is the failing one
    ....