Fix dynamic parameter completion

[MartinGC94]

PR Summary

Fixes the following scenario:

cd function::
Get-ChildItem C:\ -Fi<Tab>

Where tab completion wouldn't show the filesystem provider dynamic parameters, such as "-File".
The reason for this is that it tries to bind the parameters typed so far, including the partially typed parameter which wouldn't work. A check has been added so the parameter at the cursor is skipped for commands with dynamic parameters.

PR Context

Fixes #19498

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This PR has 22 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       : +19 -3
Percentile : 8.8%

Total files changed: 3

Change summary by file extension:
.cs : +11 -3
.ps1 : +8 -0

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