Remove code that isn't referenced in AAC anymore

[Chad Kittel (ckittel)]

• Remove a sample that has no Microsoft Learn consumers
• Remove unnecessary dependabot and CodeQL config (there is no content left in here)

[Copilot]

Pull request overview

Removes an unreferenced Azure Virtual Network Manager sample and obsolete repository automation.

Changes:

• Deletes the secured hub-and-spoke sample and all Bicep modules.
• Removes unused CodeQL and Dependabot configurations.
• Leaves no stale references to the deleted sample.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
solutions/avnm-secured-hub-and-spoke/README.md	Removes sample documentation.
solutions/avnm-secured-hub-and-spoke/bicep/main.bicep	Removes the deployment entry point.
solutions/avnm-secured-hub-and-spoke/bicep/modules/spoke.bicep	Removes spoke resources.
solutions/avnm-secured-hub-and-spoke/bicep/modules/hub.bicep	Removes hub resources.
solutions/avnm-secured-hub-and-spoke/bicep/modules/dynMemberPolicy.bicep	Removes dynamic membership policy resources.
solutions/avnm-secured-hub-and-spoke/bicep/modules/avnmDeploymentScript.bicep	Removes configuration deployment scripting.
solutions/avnm-secured-hub-and-spoke/bicep/modules/avnm.bicep	Removes Virtual Network Manager resources.
.github/workflows/codeql-analysis.yml	Removes the obsolete CodeQL workflow.
.github/dependabot.yml	Removes the obsolete NuGet update configuration.

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