Fix completion for PSCustomObject variable properties

[MartinGC94]

PR Summary

Fixes tab completion scenarios like:

PS C:\> $Test = Get-ChildItem C:\ | select Name,LastWriteTime
PS C:\> $Test | where {$_.las<Tab>

Where the script text that assigns a value to the variable is unavailable so it infers the members based on the current variable value. Previously it would just show the PSObject members but now it shows the custom member values as well.

PR Context

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[ghost]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
Maintainer, please provide feedback and/or mark it as Waiting on Author

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This PR has 17 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Extra Small
Size       : +16 -1
Percentile : 6.8%

Total files changed: 2

Change summary by file extension:
.cs : +11 -1
.ps1 : +5 -0

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[daxian-dbw]

LGTM

[daxian-dbw]

The markdown link check failure was due to the CodeCoverageAnalysis.md doc, which was already removed. So, it doesn't block this PR.

[ghost]

🎉v7.4.0-preview.2 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes