Fall back to default inputs

[ncalteen]

This PR adds a check so that, if an input is not present in the environment variables, the default value is used from the action.yml/action.yaml file (if a default is present).

[Copilot]

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src/stubs/core/core.ts:282

• Add a test case to verify that the default value for boolean inputs is correctly interpreted as a boolean.

input = EnvMeta.inputs[name].default.trim()

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[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	4		0	0.05s
✅ JAVASCRIPT	prettier	11		0	1.36s
✅ JSON	jsonlint	23		0	0.42s
✅ JSON	npm-package-json-lint	yes		no	0.86s
✅ JSON	prettier	23		0	3.76s
✅ MARKDOWN	markdownlint	8		0	0.88s
✅ REPOSITORY	checkov	yes		no	20.72s
✅ REPOSITORY	gitleaks	yes		no	1.1s
✅ REPOSITORY	git_diff	yes		no	0.04s
✅ REPOSITORY	grype	yes		no	20.78s
✅ REPOSITORY	secretlint	yes		no	1.09s
✅ REPOSITORY	trivy	yes		no	10.77s
✅ REPOSITORY	trivy-sbom	yes		no	1.06s
✅ REPOSITORY	trufflehog	yes		no	28.97s
✅ TYPESCRIPT	prettier	60		0	4.67s
✅ YAML	prettier	21		0	1.93s
✅ YAML	yamllint	21		0	1.36s

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