Snippet that can be added to the profile to turn git aliases into PowerShell commands. Note: this solution doesn't support parameters.

GitAliasesHelper.ps1

$gitAliases = (git config --global -l).Where{ $_ -match '^alias\.'}.ForEach{$_ -replace '^alias\.(\w+).*', '$1'}

$ExecutionContext.InvokeCommand.CommandNotFoundAction = { 
    param ($name, $eventArgs) 
    if ($name -in $gitAliases) { 
        $alias = $name
    } elseif ($aliases = $gitAliases -match [regex]::Escape($name)) { 
        $alias = $aliases | Sort-Object -Property Length  | Select-Object -First 1 
    } 
    
    if ($alias) { 
        $eventArgs.CommandScriptBlock = [scriptblock]::Create("git $alias") 
    } 
}