fix(github,tests): Split coverage workflow, add coverage_missed_reason to more ported tests

[marioevz]

🗒️ Description

Coverage workflow changes

The coverage workflow is now split into several scripts in order to make the flow more modular and approachable.

This includes the following new script files:

• .github/scripts/check_changed_tests.sh
• .github/scripts/fill_introduced_tests.sh
• .github/scripts/fill_prepatched_tests.sh
• .github/scripts/parse_ported_tests.sh
• .github/scripts/run_coverage.sh
• .github/scripts/verify_coverage.sh

Tests with new "Coverage missing reason"

• tests/constantinople/eip1014_create2/test_create_returndata.py
• tests/frontier/create/test_create_one_byte.py

Fixed tests where the coverage missing was an actual problem

• tests/frontier/identity_precompile/test_identity_returndatasize.py
• tests/frontier/precompiles/test_precompiles.py

🔗 Related Issues

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.