[Hotfix Main]: [FXC-6421] fix(): Remove selectors from GAI meshing output to fix hash inconsistency

[github-actions]

Hotfix of PR #1903 (#1903) to the main branch.
Hey @benflexcompute, please review this hotfix PR created from your original PR.

---

Note

Medium Risk
Changes GAI surface-meshing translation output by removing selectors, which could affect any downstream consumer that previously relied on that field. Scope is small and covered by a new regression test verifying deterministic hashing across runs.

Overview
In Geometry AI (GAI) surface meshing translation, the filtered JSON output now recursively removes any selectors fields after selector expansion to avoid random selector_id values causing non-deterministic config hashes.

Adds a regression test that builds equivalent selector-based meshing inputs twice and asserts the translated JSON contains no selectors and produces identical hashes across runs.

^{Written by Cursor Bugbot for commit c4cfbd9. This will update automatically on new commits. Configure here.}