ci: pass quality gate when test_level is none (lint-only PRs)

[ko3n1g]

Summary

Fixes the CI_QA_Gate always failing for PRs that have no CI label (e.g. docs-only or workflow-only changes).

Root cause

ALL_SUCCESS required test_level != 'none' as part of a conjunction, so when no tests were scheduled the entire condition evaluated to false — even if lint passed cleanly. The comment above the expression already said "Job is considered successful if nothing was run", but the logic didn't implement that.

Fix

Replace test_level != 'none' && <all jobs passed> with test_level == 'none' || <all jobs passed>, which correctly short-circuits to true when no tests were scheduled.

Before / After

-              needs.pre-flight.outputs.test_level != 'none' &&
-              needs.sphinx-build.result == 'success' &&
+              needs.pre-flight.outputs.test_level == 'none' ||
+              (
+                needs.sphinx-build.result == 'success' &&
               ...
+              )

Unblocks

• ci: add sync-skills workflow #2265

Test plan

• This PR itself should pass the quality gate with test_level = none

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