Emit warning if `ConvertTo-Json` exceeds `-Depth` value

[sdwheeler]

Summary of the new document or enhancement

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• List of articles that need to be updated: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/convertto-json?view=powershell-7.2
• New articles that need to be created:
• Link(s) to related code PR(s) in the PowerShell/PowerShell repo: Emit warning if ConvertTo-Json exceeds -Depth value PowerShell/PowerShell#13692
• Link(s) to related issue(s) in the PowerShell/PowerShell repo: Consider removing the default -Depth value from ConvertTo-Json PowerShell/PowerShell#8393

Description of what changed

When using ConvertTo-Json, the default -Depth value is 2 to avoid recursion for objects like Services on Windows. Users who do not set a deep enough depth may be losing data they may not be aware of as they expected full fidelity of the object to be serialized to JSON. The change agreed by @PowerShell/powershell-committee is to emit a warning message once the depth is exceeded. The warning is only emitted once per object serialized, but note that arrays are treated as a single object and not unrolled.