Add validator checks for data_gene_panel_matrix vs _sequenced case list

[rujuthaa]

Summary

Implements additional data_gene_panel_matrix.txt validations from docs:

• If mutation gene panel is specified (not NA), sample must be in _sequenced case list.
• If a sample is in _sequenced, it must exist in the mutation column of gene panel matrix.
• If a sample is in _sequenced, mutation gene panel cannot be NA.

Fixes #10842

Changes

• Updated validator logic in scripts/importer/validateData.py.
• Added/updated unit tests in tests/unit_tests_validate_data.py.
• Added fixtures:
  • tests/test_data/data_gene_matrix_sequenced_na.txt
  • tests/test_data/data_gene_matrix_missing_sequenced_sample.txt
• Updated existing test fixtures to keep system/unit tests consistent with new rule:
  • tests/test_data/data_gene_matrix_duplicate_sample.txt
  • tests/test_data/study_es_0/data_gene_panel_matrix.txt
  • tests/test_data/study_es_0/result_report.html

Validation

• Ran full test suite:
  • ./test_scripts.sh
• Result:
  • Ran 184 tests ... OK (skipped=1)