GitHub Actions: Add apt mirror to make package download more robust

- Download of Ubuntu packages from Azure is unstable. Add mirror sites to improve reliability.
- Improve use of clang-format and include source code changes

ApplicationLibCode/ProjectDataModel/Intersections/RimIntersectionResultsDefinitionCollection.h

@@ -43,7 +43,7 @@ public:
 protected:
     caf::PdmFieldHandle* objectToggleField() override;
     void                 fieldChangedByUi( const caf::PdmFieldHandle* changedField, const QVariant& oldValue, const QVariant& newValue ) override;
-    void         initAfterRead() override;
+    void                 initAfterRead() override;
 
 private:
     caf::PdmField<bool>                                       m_isActive;