`&` background invocation operator should `-WorkingDirectory` when starting a job

PR #10324 is merged and now we can use `-WorkingDirectory` when starting a job for background invocation operator. 

The following code can be replaced:

https://github.com/PowerShell/PowerShell/blob/f69f30ba49c13ddd601724b35634bf4d1f44e31d/src/System.Management.Automation/engine/runtime/Operations/MiscOps.cs#L529-L532

# Steps to reproduce

```powershell

```

# Expected behavior

```none

```

# Actual behavior

```none

```

# Environment data



```none
Name                           Value
----                           -----
PSVersion                      7.0.0-daily.20190906
PSEdition                      Core
GitCommitId                    7.0.0-daily.20190906
OS                             Microsoft Windows 10.0.18978
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

```

	const string cmdPrefix = @"Microsoft.PowerShell.Management\Set-Location -LiteralPath $using:pwd ; ";
	// Minimize allocations by initializing the stringbuilder to the size of the source string + prefix + space for ${using:} * 2
	System.Text.StringBuilder updatedScriptblock = new System.Text.StringBuilder(cmdPrefix.Length + scriptblockBodyString.Length + 18);
	updatedScriptblock.Append(cmdPrefix);

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`&` background invocation operator should `-WorkingDirectory` when starting a job #10515

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& background invocation operator should -WorkingDirectory when starting a job #10515

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`&` background invocation operator should `-WorkingDirectory` when starting a job #10515