Use ListSecretVersionIds when secret is write-only

[josnyder-2]

Description

Presently, the provider reads secrets from AWS under all circumstances, even when it is configured in write-only mode by use of secret_string_wo. As a result, it is not possible for an unprivileged user who is working with a statefile that has write-only secrets to perform a terraform plan -refresh=true.

This pull request modifies the behavior so that, when in write-only mode, we use ListSecretVersionIds instead of GetSecretValue.

[github-actions]

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