Helm chart value to set awsAccessSecret not optional

[Fausto-R91]

This PR introduces a new value to the Helm chart, enabling users to configure whether the AWS access secret is optional.

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[muddyfish]

Hi @Fausto-R91

We're interested in learning what the usecase for this change is, would you be able to explain more why it's needed?

[Fausto-R91]

Hi,
I'm pulling secrets from an external vault (using External Secrets Operator) and I'm deploying this CSI Driver with a GitOps pipeline (managed by ArgoCD). Therefore, I cannot guarantee that the secret will be ready before the driver. With this PR merged and the value awsAccessSecret.optional set to false, the driver will fail to deploy until the secret has been created. As the cluster is not on EKS, the secret is the easiest way to pass credentials to the driver.