PR Summary

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.

The SecureString tests were updated because it seems a credscan change identified a test "secret" in the script and caused CI to fail. After fixing that, I needed to have scriptanalyzer not fail on using plaintext "secret".

PR Context

Fix #8393

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