Always On - Backups on Secondary, fail the check on other replicas

[Ant-Green]

Bug Report

General Troubleshooting steps

• Verified running the latest release of dbachecks?

Does (Find-Module dbachecks).Version match (Get-Module dbachecks).Version.ToString()

• Verified errors are not related to permissions?
• Can duplicate in new/clean PowerShell session (clean = powershell -NoProfile)?

Version Information

• Operating System (Name|Version):
• PowerShell Version: <PS5.1>
• SQL Server (Edition|Version): <2014 EE>

Steps to Reproduce

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• Attach any screenshots (if possible/allowed)
• Attach output from PowerShell console (if possible/allowed)

Description of Bug

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I offload my backups to a secondary replica.

This then makes the backups check on the primary or other secondaries report failure as they don't have records in MSDB.

Expected outcome - as part of an AOAG, check all replicas of the group to see which one has the latest backup information and report success for all replicas when a backup is found within the thresholds
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