Normalize selection scalar validation errors

[FlorianPfaff]

Summary

• Normalize scalar conversion failures in selection helper validators to ValueError.
• Add regression coverage for uncoercible scalar-like inputs.

Validation

• Self-contained smoke check for the new validation path.
• Full suite not run in this connector session.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	71.08s
✅ JSON	prettier	7	0	0	0	1.47s
✅ JSON	v8r	7		0	0	4.06s
✅ MARKDOWN	markdownlint	68	0	0	0	1.83s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.72s
✅ PYTHON	black	1205	37	0	0	67.53s
✅ PYTHON	isort	1205	71	0	0	5.47s
✅ REPOSITORY	checkov	yes		no	no	49.65s
✅ REPOSITORY	gitleaks	yes		no	no	10.78s
✅ REPOSITORY	git_diff	yes		no	no	0.25s
✅ REPOSITORY	secretlint	yes		no	no	46.4s
✅ REPOSITORY	syft	yes		no	no	4.69s
✅ REPOSITORY	trivy-sbom	yes		no	no	7.44s
✅ REPOSITORY	trufflehog	yes		no	no	18.89s
✅ YAML	prettier	11	0	0	0	0.75s
✅ YAML	v8r	11		0	0	12.18s
✅ YAML	yamllint	11		0	0	0.48s

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