Traces with spec-checking error blocks may contain absolute (also non-normalized) paths

[starpit]

Describe the bug
Perhaps we should use relative (and normalized) paths here? e.g.

msg: |-
  Type errors during spec checking:
  /Users/starpit/git/prompt-declaration-language/pdl-live-react/demos/../demos/error.pdl:3 - Missing required field: answers
  /Users/starpit/git/prompt-declaration-language/pdl-live-react/demos/../demos/error.pdl:3 - Missing required field: questions
  /Users/starpit/git/prompt-declaration-language/pdl-live-react/demos/../demos/error.pdl:3 - Field not allowed: source_code
  /Users/starpit/git/prompt-declaration-language/pdl-live-react/demos/../demos/error.pdl:3 - Field not allowed: repo_info

To Reproduce
See the paths above

Expected behavior
Absolute paths are long, and also mean that traces preserve potentially sensitive information (in the absolute path).

Screenshots
n/a

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. Chrome, Safari]
• Version [e.g. 22]

Additional context
n/a