fix(aws-secrets): use AWS secrets only if enabled

[bdellegrazie]

Only set the AWS variables if the enabled flag is true for secrets lookup

Existing Issue

Fixes #348.

Changes proposed in this pull request

• only set AWS region variable if AWS Secrets Manager or Ssm integration is enabled

Reviewer Checklist

• [ ] Code reviewed
• [ ] Topgun tests run
• [ ] Back-port if needed
• [ ] Is the correct branch targeted? (master or dev)