Use disable_file_fixes + network_filter instead of rm -rf

The Codecov CLI walks the git index and crashes with FileNotFoundError
when tracked files are deleted. Use disable_file_fixes to skip the
file-reading step, and network_filter to restrict source discovery.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: facontidavide

.github/workflows/cmake_ubuntu.yml

@@ -96,20 +96,14 @@ jobs:
              --ignore-errors unused
         lcov --list coverage.info
 
-    - name: Prune directories from Codecov file discovery
-      run: |
-        # Remove directories we don't want Codecov to report as source files.
-        # Coverage data for these was already stripped by lcov above.
-        # Note: 3rdparty/ is kept because the CLI resolves file references from it.
-        rm -rf examples sample_nodes tests tools \
-               include/behaviortree_cpp/contrib \
-               include/behaviortree_cpp/flatbuffers
-
     - name: Upload coverage reports to Codecov
       uses: codecov/codecov-action@v5
       with:
         files: coverage.info
         flags: unittests
         disable_search: true
+        disable_file_fixes: true
         plugins: noop
+        network_filter: >-
+          include/behaviortree_cpp/,src/
         token: ${{ secrets.CODECOV_TOKEN }}