chore(docs): add reference to infrahub-backup for k8s helm

[fatih-acar]

Summary by CodeRabbit

• Documentation
  • Enhanced database backup and restore documentation with comprehensive Kubernetes Helm guidance. Users deploying on Kubernetes can now reference step-by-step backup procedures and restore workflows tailored to their deployment environment, complementing existing Docker Compose and CLI instructions.

[coderabbitai]

Walkthrough

This pull request updates the database backup documentation by adding Kubernetes Helm tab items across multiple sections. The changes introduce Kubernetes-specific backup and restore guidance that appears alongside existing Docker Compose and CLI options in the backup and restore workflows. Tab group identifiers were updated in the restart services section, and additional Kubernetes Helm references were inserted throughout the backup and restore procedures to provide comprehensive coverage for Kubernetes deployments.

🚥 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 title accurately describes the main change: adding Kubernetes Helm references to the database backup documentation guide.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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