fix: use correct names for autoscaler policies configuration

[kayman-mk]

Description

PascalCase was used to create the [[runners.autoscaler.policy]] which is wrong according to the documentation. This PR fixes the names in the configuration file. IdleCount --> idle_count

The worker instances were used once and then terminated. This resulted in a high load of some AWS autoscaling APIs and we got rate limiting. In the end most pipelines failed.

Verification

Deployed the changes into my environment. The worker machines are reused now.

[github-actions]

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[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	1.57s
✅ REPOSITORY	checkov	yes		no	15.99s
✅ REPOSITORY	dustilock	yes		no	0.23s
✅ REPOSITORY	gitleaks	yes		no	1.34s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	12.25s
✅ REPOSITORY	secretlint	yes		no	0.99s
✅ REPOSITORY	syft	yes		no	0.35s
✅ REPOSITORY	trivy-sbom	yes		no	1.1s
✅ REPOSITORY	trufflehog	yes		no	6.15s
✅ SPELL	cspell	2		0	2.57s
✅ TERRAFORM	terraform-fmt	1	0	0	0.11s

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