Update docs for VPC integration

[vishesh92]

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Pull Request Overview

This PR updates the documentation for VPC integration in CloudStack clusters. It expands the existing network configuration instructions to include details on creating and managing VPC resources, adds CLI examples for listing VPCs, and provides a sample YAML configuration snippet to illustrate the setup.

Comments suppressed due to low confidence (1)

docs/book/src/clustercloudstack/configuration.md:76

• Verify that the jq filter '.vpc[]' correctly matches the output of 'cmk list vpcs'. If the output key is plural or different, update the filter for consistency.

cmk list vpcs listall=true zoneid=<zoneid> | jq '.vpc[] | {name, id}'

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.79%. Comparing base (d597e80) to head (a1cbed8).
Report is 96 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #434      +/-   ##
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+ Coverage   25.66%   25.79%   +0.12%     
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  Files          59       72      +13     
  Lines        5563     6742    +1179     
==========================================
+ Hits         1428     1739     +311     
- Misses       3996     4839     +843     
- Partials      139      164      +25     

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