Enhance ExplicitImports QA testing

[ChrisRackauckas]

Summary

This PR enhances the ExplicitImports QA testing infrastructure for DiffEqFlux.jl by adding comprehensive explicit imports validation.

Changes Made

• ✅ Enhanced ExplicitImports Testing: Added check_no_self_qualified_accesses test to the existing QA testing suite
• ✅ Comprehensive Import Validation: All explicit imports tests pass, confirming excellent import practices
• ✅ QA Infrastructure: ExplicitImports and ReTestItems testing already properly configured in test dependencies

Testing Status

• ✅ All explicit imports tests pass
• ✅ No implicit imports detected
• ✅ No stale explicit imports found
• ✅ No self-qualified accesses found
• ✅ QA testing infrastructure working correctly

Analysis Results

DiffEqFlux.jl already has excellent explicit import practices! The codebase passes all ExplicitImports.jl checks:

• No implicit imports: All imports are explicit and properly declared
• No stale imports: All imported symbols are actually used
• No self-qualified accesses: Proper module qualification practices
• Proper test setup: ExplicitImports testing infrastructure is correctly configured

This PR simply adds one additional check to make the QA testing even more comprehensive.

Impact

• Improves code quality assurance
• Ensures comprehensive explicit imports validation
• Maintains excellent import practices in the codebase
• No breaking changes or dependencies added

🤖 Generated with Claude Code