feat: make the graceful terminate Lambda timeout configurable

[kayman-mk]

Description

Add var.runner_terminate_ec2_timeout_duration with a default of 90 seconds. Makes it possible to configure the timeout in case hundreds of workers are controlled by a single GitLab Runner Agent. Otherwise the Lambda function might fail and does not remove any worker in case the Agent is stopped.

Closes #1149

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🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	1.62s
✅ REPOSITORY	checkov	yes		no	15.61s
✅ REPOSITORY	dustilock	yes		no	0.38s
✅ REPOSITORY	gitleaks	yes		no	1.22s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	12.6s
✅ REPOSITORY	secretlint	yes		no	0.97s
✅ REPOSITORY	syft	yes		no	0.34s
✅ REPOSITORY	trivy-sbom	yes		no	1.43s
✅ REPOSITORY	trufflehog	yes		no	4.5s
✅ SPELL	cspell	6		0	2.94s
✅ TERRAFORM	terraform-fmt	5	0	0	0.48s

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