[Feature]: Get-AzResourceGroup should support multiple Tags

[defenestration]

Description of the new feature

Getting a single KV pair seems to work for Get-AzResourceGroup, but multiple tags seem to error.

The command Get-AzResourceGroup -Tag @{"CostCenter" = "Platform" ; "Product" = "Stuff"}

Currently gives error: Get-AzResourceGroup: Invalid tag format. Expect @{tagName = $null} or @{tagName = "tagValue"}

I noticed that Get-AzResource seems to work fine with multiple tags already.

Proposed implementation details (optional)

No response