Fixing checkout action of helm chart release GHA

[mitali-salvi]

See helm/chart-releaser-action#13 and helm/chart-releaser-action#36

Description of changes:
Helm chart releaser action was unable to release the helm chart because it could not detect any changes in git history, this is because git rev-list --max-parents=0 --first-parent HEAD is expecting the full git history for the branch. So anyone using the checkout action will have this issue.
Also the releaser action has example here https://github.com/helm/charts-repo-actions-demo/blob/main/.github/workflows/release.yaml

1. Added full-depth: 0 to pull in entire git history

(24-04-26 21:03:52) <0> [~]  
dev-dsk-mitsalvi-2b-dd18fa62 % helm search repo aws-observability
NAME                                             	CHART VERSION	APP VERSION	DESCRIPTION                                     
aws-observability/amazon-cloudwatch-observability	1.5.4        	1.0.0      	A Helm chart for Amazon CloudWatch Observability

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