Keep heterogeneous evaluation result columns aligned

[FlorianPfaff]

Summary

• allow grouped evaluation rows to contain optional metric fields
• backfill newly introduced columns with None for earlier rows
• append None when a later row omits a previously seen field
• add focused regression coverage for both late-added and missing metrics

Bug

group_results_by_filter() assumed that every row for a filter contained exactly the same keys. When a later configuration introduced an optional metric, the function indexed a column that had never been initialized and raised KeyError. When a later configuration omitted a metric, the corresponding list was not extended, so grouped columns represented different numbers of rows and no longer aligned by parameter.

Impact

Evaluation and plotting code can now safely consume summaries whose configurations expose different optional metrics. Every grouped column contains exactly one value per sorted row, using None for unavailable values.

Validation

• exercised the regression in isolation with late-added and omitted metric keys
• verified the existing mixed numeric/string/None parameter ordering remains unchanged
• compared the branch against current main; only the grouping helper and its focused test are modified

A full repository test run was not available in this environment because the checkout could not be downloaded; repository access was provided through the GitHub connector.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	12.29s
✅ JSON	prettier	7	0	0	0	0.41s
✅ JSON	v8r	7		0	0	2.58s
✅ MARKDOWN	markdownlint	68	0	0	0	0.94s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.2s
✅ PYTHON	black	1489	182	0	0	53.52s
✅ PYTHON	isort	1489	327	0	0	1.52s
✅ REPOSITORY	betterleaks	yes		no	no	1.35s
✅ REPOSITORY	checkov	yes		no	no	36.76s
✅ REPOSITORY	gitleaks	yes		no	no	9.5s
✅ REPOSITORY	git_diff	yes		no	no	0.09s
✅ REPOSITORY	secretlint	yes		no	no	35.08s
✅ REPOSITORY	syft	yes		no	no	4.28s
✅ REPOSITORY	trivy-sbom	yes		no	no	4.91s
✅ REPOSITORY	trufflehog	yes		no	no	20.05s
✅ YAML	prettier	11	0	0	0	0.5s
✅ YAML	v8r	11		0	0	5.95s
✅ YAML	yamllint	11		0	0	0.44s

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