fix(forms-api): resolve type errors

[google-labs-jules[bot]]

This pull request resolves TypeScript errors in the forms-api directory by adding JSDoc annotations, correcting type casting, and removing unhelpful try/catch blocks. It also improves code clarity by using response.getContentText() instead of string coercion.

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PR created automatically by Jules for task 14108074084412929599 started by @jpoehnelt

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