Add additional config path error wrapping and index to embeds

[deliahu]

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Checklist:

• Run automated tests (./build/test.sh)
• Test end to end manually (e.g. rebuild registry/operator and run cx refresh in an example folder)
• Add license header to each new file
• Update documentation
• Update examples and cx init
• Alert team if dev environment changed
• Cherry-pick into release branches if it's a bugfix
• Delete the branch once it's merged

[1vn]

minor comments

[1vn]

LGTM