chore: show error message if the pre-registered token cannot be found

[kayman-mk]

Description

Add an error message to the GitLab Runner log in case the pre-registered token can't be found in the SSM parameter store.

Closes #1139

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🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	1.46s
✅ REPOSITORY	checkov	yes		no	15.18s
✅ REPOSITORY	dustilock	yes		no	0.24s
✅ REPOSITORY	gitleaks	yes		no	1.34s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	12.08s
✅ REPOSITORY	secretlint	yes		no	0.99s
✅ REPOSITORY	syft	yes		no	0.38s
✅ REPOSITORY	trivy-sbom	yes		no	1.07s
✅ REPOSITORY	trufflehog	yes		no	4.02s

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