Bump Azure Service Operator to v2.18.0

[mboersma]

What this PR does / why we need it:

Bumps Azure Service Operator from v2.17.0 to v2.18.0.

v2.18.0 removes the containerservice/v1api20231001 and v1api20230201 API versions, so this PR migrates CAPZ's stable managed-cluster/agent-pool alias to v1api20250801 (the existing hub) and drops the v1api20230201 scheme registration. It also adds a stored-version migration for managedclusters/managedclustersagentpools (stale v1api20231001storage), since early CAPZ-bundled ASO used that as the storage version.

Note: ASO must be upgraded one minor at a time, so a release carrying ASO v2.17.0 should ship before/independently of this one.

Special notes for your reviewer:

Targets v2.18.0 (not later) because v2.19.0 additionally removes v1api20240402preview, which CAPZ still uses.

Release note:

Bump Azure Service Operator to v2.18.0

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[kubernetes-prow]

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[mboersma]

/test pull-cluster-api-provider-azure-apiversion-upgrade

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 44.07%. Comparing base (47cc48d) to head (9e34051).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6390   +/-   ##
=======================================
  Coverage   44.06%   44.07%           
=======================================
  Files         289      289           
  Lines       25383    25382    -1     
=======================================
+ Hits        11185    11187    +2     
+ Misses      13422    13419    -3     
  Partials      776      776           

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[mboersma]

/hold

We need to do one ASO minor bump per CAPZ minor bump in order to have the upgrade path work. So this needs to wait until CAPZ 1.26.