snippet_provider: Use proper casing of `VsCode` in identifiers (#29038)

This PR renames some identifiers in the `snippet_provider` to use the
correct casing of `VsCode`.

Release Notes:

- N/A
269f6403ddMarshall Bowers committed on 4/18/2025, 12:11:54 PM· committed by GitHubparent3538ace
4 files changedLine totals unavailable