refactor: Limit learnmorelink to one link per recommendation

[oZakari]

Overview/Summary

In order to align to Azure Advisor schema, we need to reduce the number of allowed links per recommendation to 1.

I have used AI to select the most relevant links to keep.

Related Issues/Work Items

Fixes AB#38474

Breaking Changes

1. None

As part of this pull request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• Performed testing and provided evidence (e.g. screenshot of output) for any changes associated to ARG queries
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

Copilot reviewed 27 out of 42 changed files in this pull request and generated no comments.

Files not reviewed (15)

• azure-resources/Compute/virtualMachines/recommendations.yaml: Evaluated as low risk
• azure-resources/Databricks/workspaces/recommendations.yaml: Evaluated as low risk
• azure-resources/Dashboard/grafana/recommendations.yaml: Evaluated as low risk
• azure-resources/ContainerService/managedClusters/recommendations.yaml: Evaluated as low risk
• azure-resources/ContainerRegistry/registries/recommendations.yaml: Evaluated as low risk
• azure-resources/DocumentDB/databaseAccounts/recommendations.yaml: Evaluated as low risk
• azure-resources/Devices/iotHubs/recommendations.yaml: Evaluated as low risk
• azure-resources/Compute/virtualMachineScaleSets/recommendations.yaml: Evaluated as low risk
• azure-resources/Compute/galleries/recommendations.yaml: Evaluated as low risk
• azure-resources/AVS/privateClouds/recommendations.yaml: Evaluated as low risk
• azure-resources/MachineLearningServices/workspaces/recommendations.yaml: Evaluated as low risk
• azure-resources/NetApp/netAppAccounts/recommendations.yaml: Evaluated as low risk
• azure-resources/Network/applicationGateways/recommendations.yaml: Evaluated as low risk
• azure-resources/Compute/disks/recommendations.yaml: Evaluated as low risk
• azure-resources/Cdn/profiles/recommendations.yaml: Evaluated as low risk

[ejhenry]

Thanks @oZakari! LGTM