Incorrect comma highlighting when inside string

[slavizh]

Bicep version
Bicep CLI version 0.4.613 (d826ce8)

Describe the bug
When you use function like union inside '' the comma color is different. See screenshot.

[anthony-c-martin]

Implementation notes:

1. I think here we've got the semantic tokens (100% accurate) being overlayed on top of the Textmate grammar (not very accurate).
2. Textmate has its own mechanism of scoping, and the simplest implementation (which I went for) is to nest them in a hierarchy. So if you're in a 'string interpolation hole' scope, you're also in a 'string' scope. Textmate (AFAIK) scoping is also purely additive. The color is set by the 'string' scope, and because the 'string interpolation hole' scope doesn't reset this color, you see it shining through.
3. AFAIK semantic tokens do allow you to override the scope set by Textmate, but we currently don't publish tokens for most tokens. Again, because there's no color being set by semantic tokens, you see the 'string' color shining through from the Textmate grammar.

The fix is probably going to be to publish data for all tokens via semantic tokens, but it might also be interesting to see if there's an option in VSCode to disable Textmate when semantic tokens are in use.