Add support for CSharpHelper for List literals

[yinzara]

Fixes #19274

Also relates to npgsql/efcore.pg#2402

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        Fixes #bugnumber

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[dnfadmin]

All CLA requirements met.

[yinzara]

All comments addressed. TY!

[roji]

Note: waiting for @bricelam to make sure it aligns with his work etc.

[yinzara]

All comments have been addressed. I think we're ok for merge.

[ghost]

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