docs: add comment to justify linting ignore

[TotalDwarf03]

Overview

Add justification for ignoring CKV_AWS_272.

Since we use container images for our Lambdas, code signing is not needed.

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
⚠️ BASH	bash-exec	4		2	0	0.03s
✅ BASH	shellcheck	4		0	0	0.18s
✅ BASH	shfmt	4		0	0	0.0s
✅ CSHARP	csharpier	1		0	0	0.79s
✅ DOCKERFILE	hadolint	1		0	0	0.14s
✅ JSON	jsonlint	1		0	0	0.22s
✅ JSON	prettier	1		0	0	0.56s
✅ JSON	v8r	1		0	0	2.32s
✅ MARKDOWN	markdownlint	11		0	0	1.07s
✅ MARKDOWN	markdown-table-formatter	11		0	0	0.41s
✅ REPOSITORY	checkov	yes		no	no	27.61s
✅ REPOSITORY	dustilock	yes		no	no	0.01s
✅ REPOSITORY	gitleaks	yes		no	no	3.79s
✅ REPOSITORY	grype	yes		no	no	45.94s
✅ REPOSITORY	kics	yes		no	no	41.57s
✅ REPOSITORY	secretlint	yes		no	no	1.16s
✅ REPOSITORY	syft	yes		no	no	2.97s
✅ REPOSITORY	trivy	yes		no	no	14.84s
✅ REPOSITORY	trivy-sbom	yes		no	no	0.47s
✅ TERRAFORM	terraform-fmt	6		0	0	0.38s
✅ YAML	prettier	8		0	0	0.72s
✅ YAML	v8r	8		0	0	7.16s
✅ YAML	yamllint	8		0	0	0.64s

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