feat: Add failover groups to avm/res/sql/server

[peterbud]

Description

This PR adds support for failover groups for the avm/res/sql/server module.

Fixes #3609

Questions:

• In the failover group test, I have a dependency (the secondary SQL Server): should I move that to a separate dependencies module, or is it OK to have it in the main test file?
• The test contains hard-coded locations to ensure proper region pairs. Is that the preferred way to override location?
• Should I extend max and/or waf test with this module?

Pipeline Reference

Pipeline

Pls note I don't have Maintenance Window available in my sbscription.

Type of Change

• Update to CI Environment or utilities (Non-module affecting changes)
• Azure Verified Module updates:
  • Bugfix containing backwards-compatible bug fixes, and I have NOT bumped the MAJOR or MINOR version in version.json:
    • Someone has opened a bug report issue, and I have included "Closes #{bug_report_issue_number}" in the PR description.
    • The bug was found by the module author, and no one has opened an issue to report it yet.
  • Feature update backwards compatible feature updates, and I have bumped the MINOR version in version.json.
  • Breaking changes and I have bumped the MAJOR version in version.json.
  • Update to documentation

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• I have run Set-AVMModule locally to generate the supporting module files.
• My corresponding pipelines / checks run clean and green without any errors or warnings

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Tip

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Important

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