Decrease size back to 8GB, remove debug statement

[peterdeme]

Description of the change

We fixed the issue, but it wasn't the size bump that fixed it. So now decreasing it back to 8GB and removing the statement.

https://github.com/spacelift-io/spacelift-worker-image/actions/runs/11975118340/job/33387759381

Type of change

• Other

Checklists

Development

• All necessary variables have been defined, with defaults if applicable;
• The HCL code is formatted;
• An AMI has been created in some AWS account, and the AMI is working as expected;

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached;
• This pull request is no longer marked as "draft";
• Reviewers have been assigned;
• Changes have been reviewed by at least one other engineer;