This PR migrates 224 typed JSON response sites across 46 files to
`codersdk.ReadBodyAsJSON`, so invalid 2xx bodies return structured
errors while preserving URL credential redaction.
It intentionally excludes agent-direct HTTP, Azure IMDS, `UseNumber`,
and chat paths; stacked on coder/coder#27804, with chat and lint
follow-ups in coder/coder#27858 and coder/coder#27859. Refs
coder/coder#27044.
Reviewed and updated by Coder Agents on behalf of @dylanhuff-at-coder.
Adds an api endpoint to grab all available sync field options for IDP
sync. This is for autocomplete on idp sync forms. This is required for
organization admins to have some insight into the claim fields available
when configuring group/role sync.
dylanhuff-at-coder