chore(pyright-language-service): remove unused hocon-parser and hoconjs dependencies

[yangzhang75]

What changes were proposed in this PR?

Removes the dead hocon-parser integration from pyright-language-service. The hoconParser call was removed in #3150 (when the language server became a standalone microservice) and the leftover import in #3415, but the two dependencies and the type stub were never cleaned up.

• Delete src/types/hocon-parser.d.ts (type stub for an unused module)
• Remove hocon-parser and hoconjs from package.json
• Regenerate yarn.lock via yarn install

Any related issues, documentation, discussions?

Closes #5442

How was this PR tested?

• grep -rn "hocon" pyright-language-service/src returns nothing
• The TypeScript build passes (tsc --noEmit -p tsconfig.json, exit 0)
• No code in the service imports hocon-parser/hoconjs, so this is a pure dead-code removal

Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Code (Claude Opus 4.8)

[xuang7]

Could you assign a reviewer for this PR? @chenlica

[Yicong-Huang]

I am actually not sure if we still need those files, because we don't have test cases to guard it. Not sure if language service can still work with this change. I don't want to change it like this way unless we have verified it somehow.