Exclude redundant parameter aliases from completion results

[MartinGC94]

PR Summary

Exclude parameter aliases from completion results when the real parameter is available. For example: Get-ChildItem -P<Tab> will not show the alias pv because PipelineVariable is already included in the results. You can still tab complete parameter aliases if they don't conflict with the real parameter, for example: Get-NetIPAddress -if<Tab> will still show ifIndex and ifAlias.

Also replaced some linq usage with foreach loops.

PR Context

Fixes #19376

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[daxian-dbw]

LGTM

[pull-request-quantifier-deprecated]

This PR has 46 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +29 -17
Percentile : 18.4%

Total files changed: 3

Change summary by file extension:
.cs : +16 -11
.ps1 : +13 -6

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🎉v7.4.0-preview.3 has been released which incorporates this pull request.:tada:

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