Make backend support errors robust to non-text names

[FlorianPfaff]

Summary

• centralize formatting of supported backend names
• keep error-message construction from failing when a backend label is not directly decodable

Validation

• Branch diff inspected.
• Full test suite not run in this connector-only environment.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	71.46s
✅ JSON	prettier	7	0	0	0	1.06s
✅ JSON	v8r	7		0	0	4.4s
✅ MARKDOWN	markdownlint	68	0	0	0	1.82s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.88s
✅ PYTHON	black	1205	37	0	0	59.99s
✅ PYTHON	isort	1205	71	0	0	4.02s
✅ REPOSITORY	checkov	yes		no	no	47.09s
✅ REPOSITORY	gitleaks	yes		no	no	11.73s
✅ REPOSITORY	git_diff	yes		no	no	0.31s
✅ REPOSITORY	secretlint	yes		no	no	43.75s
✅ REPOSITORY	syft	yes		no	no	4.69s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.4s
✅ REPOSITORY	trufflehog	yes		no	no	17.83s
✅ YAML	prettier	11	0	0	0	0.72s
✅ YAML	v8r	11		0	0	10.84s
✅ YAML	yamllint	11		0	0	0.46s

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