[WIP] Test changing subnet CIDRs

[Jont828]

What type of PR is this?

Just need to verify that e2e tests work with this change. Will close once done.
/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

NONE

[k8s-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.44%. Comparing base (6bc2cab) to head (9d03268).
Report is 61 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5326      +/-   ##
==========================================
- Coverage   52.52%   52.44%   -0.09%     
==========================================
  Files         272      272              
  Lines       29433    29407      -26     
==========================================
- Hits        15461    15423      -38     
- Misses      13169    13178       +9     
- Partials      803      806       +3     

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[k8s-ci-robot]

@Jont828: The following test 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-cluster-api-provider-azure-e2e	9d03268	link	true	/test pull-cluster-api-provider-azure-e2e

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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