Guard EvidenceSupport support type validation

[FlorianPfaff]

Summary

• Validate EvidenceSupport.support_type is a string before checking membership in the allowed support-type set.
• Convert unhashable invalid values such as lists into the documented ValueError path instead of leaking TypeError.
• Add a focused regression test for list-valued evidence support input.

Validation

• Inspected the final main..chatgpt-evidence-support-validation-fix diff: 2 files changed, +14/-1.
• Local full test execution was not possible in this sandbox because direct GitHub cloning is unavailable here; the added test exercises the previously crashing path directly.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	77.24s
✅ JSON	prettier	7	0	0	0	1.07s
✅ JSON	v8r	7		0	0	4.94s
✅ MARKDOWN	markdownlint	68	0	0	0	1.75s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.9s
✅ PYTHON	black	1193	30	0	0	68.55s
✅ PYTHON	isort	1193	58	0	0	7.25s
✅ REPOSITORY	checkov	yes		no	no	49.28s
✅ REPOSITORY	gitleaks	yes		no	no	10.52s
✅ REPOSITORY	git_diff	yes		no	no	0.21s
✅ REPOSITORY	secretlint	yes		no	no	37.02s
✅ REPOSITORY	syft	yes		no	no	3.61s
✅ REPOSITORY	trivy-sbom	yes		no	no	10.69s
✅ REPOSITORY	trufflehog	yes		no	no	21.07s
✅ YAML	prettier	11	0	0	0	0.75s
✅ YAML	v8r	11		0	0	12.06s
✅ YAML	yamllint	11		0	0	0.59s

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