refactor(isolated-declarations): mark return struct as non exhaustive

[DonIsaac]

This will let us add fields to IsolatedDeclarationsReturn in the future without breaking consuming code.

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[DonIsaac]

• refactor(isolated-declarations): mark return struct as non exhaustive #6374 👈
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #6374 will not alter performance

_{Comparing don/10-08-refactor_isolated-declarations_mark_return_struct_as_non_exhaustive (a504f96) with main (15dfc1d)}

Summary

✅ 29 untouched benchmarks

[graphite-app]

Merge activity

• Oct 8, 9:38 PM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Oct 8, 9:38 PM EDT: Boshen added this pull request to the Graphite merge queue.
• Oct 8, 9:53 PM EDT: The Graphite merge queue couldn't merge this PR because it was not satisfying all requirements (Failed CI: 'Spell Check').
• Oct 8, 10:02 PM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Oct 8, 10:07 PM EDT: DonIsaac merged this pull request with the Graphite merge queue.