feat[vortex-expr]: is_fallible analysis

[joseph-isaacs]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.47%. Comparing base (a63d0ab) to head (9de3313).
⚠️ Report is 8 commits behind head on develop.

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