fix: disable codecov auto-discovery to prevent unusable report uploads

The codecov action was auto-discovering coverage files from all monorepo
packages, some of which caused "Unusable report" errors. Now only the
explicit Jest and nyc lcov files from apps/meteor are uploaded.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ggazzo

.github/workflows/ci-test-unit.yml

@@ -52,3 +52,4 @@ jobs:
           verbose: true
           token: ${{ secrets.CODECOV_TOKEN }}
           files: apps/meteor/coverage/jest/lcov.info,apps/meteor/coverage/nyc/lcov.info
+          disable_search: true