Add support for CSharpHelper for Dictionary literals

[yinzara]

Fixes #19274

[X] I've read the guidelines for contributing and seen the walkthrough
[X] I've posted a comment on an issue with a detailed description of how I am planning to contribute and got approval from a member of the team
[X] The code builds and tests pass locally (also verified by our automated build checks)
Commit messages follow this format:
Summary of the changes
- Detail 1
- Detail 2

    Fixes #bugnumber

[X] Tests for the changes have been added (for bug fixes / features)
[X] Code follows the same patterns and style as existing code in this repo

[bricelam]

LGTM

[yinzara]

All comments should have been addressed. TY

[yinzara]

Any reason this isn't getting merged? @bricelam

[ghost]

Hello @bricelam!

Because this pull request has the auto-merge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

p.s. you can customize the way I help with merging this pull request, such as holding this pull request until a specific person approves. Simply @mention me (@msftbot) and give me an instruction to get started! Learn more here.

[ghost]

Apologies, while this PR appears ready to be merged, I've been configured to only merge when all checks have explicitly passed. The following integrations have not reported any progress on their checks and are blocking auto-merge:

1. Azure Pipelines

These integrations are possibly never going to report a check, and unblocking auto-merge likely requires a human being to update my configuration to exempt these integrations from requiring a passing check.

Give feedback on this

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[ghost]

Apologies, while this PR appears ready to be merged, it looks like release/7.0 is a protected branch and I have not been granted permission to perform the merge.