Fix parsing for array literals in index expressions in method calls

[MartinGC94]

PR Summary

Fixes a parsing issue where commas couldn't be used in index expressions that were used inside method calls.
So now this: [string]::join(' ', (0, 1, 2)[0, 1]) works like you would expect.

PR Context

Fixes #7004

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This PR has 15 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       : +14 -1
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Total files changed: 2

Change summary by file extension:
.cs : +7 -1
.ps1 : +7 -0

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This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
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[SeeminglyScience]

LGTM!

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🎉v7.4.0-preview.4 has been released which incorporates this pull request.:tada:

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