Add ResourceGroup field to CloudMetadata for Azure support

[slashben]

Summary

• Add ResourceGroup field to CloudMetadata struct to capture Azure Resource Group information
• This enables RuntimeAlerts from Azure Kubernetes nodes to include resource group data

Changes

• Added ResourceGroup field with JSON/BSON tags to CloudMetadata struct in armotypes/runtimeincidents.go

Context

This field will be populated by:

• Kubernetes node spec providerID (format: azure:///subscriptions/{sub}/resourceGroups/{rg}/providers/...)
• Azure IMDS metadata endpoint (resourceGroupName)

This is the first phase of a multi-repo change to add Azure Resource Group support to RuntimeAlerts.

Summary by CodeRabbit

• New Features
  • Added support for capturing Azure Resource Group information in cloud metadata.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

A new ResourceGroup field of type string is added to the CloudMetadata struct in armotypes/runtimeincidents.go. The field includes JSON and BSON serialization tags with omitempty options and stores Azure Resource Group information.

Changes

Cohort / File(s)	Summary
CloudMetadata struct expansion armotypes/runtimeincidents.go	Added ResourceGroup string field with json:"resource_group,omitempty" and bson:"resource_group,omitempty" tags to capture Azure Resource Group data

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A new field hops into view,
ResourceGroup, shiny and new!
Azure's home, stored with care,
Metadata blooms everywhere! 🌿

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately and clearly describes the main change: adding a ResourceGroup field to CloudMetadata struct for Azure support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}