PR Summary

The current code deliberately filtered out common parameters and preferring specific parameters. This resulted in tab completion where you only got results if the text matched a cmdlet parameter even though it would also match a common parameter. Fix is to use the filtering code only if it's not a tab complete situation. The tryExactMatching is only used when the cmdlet is being executed and not when tab complete is being used so we can use that to only exercise the filtering code.

PR Context

Fix #1265

PR Checklist

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    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode (which runs in a different PS Host).
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