feat: add ability to pass in iam permissions boundary

[joelmccoy]

Description of the change

Added the ability to pass in an IAM permissions boundary to this module. I already got an change merged in here for the autoscaler submodule. This is a common practice in AWS to have a permissions boundary assigned to all your IAM roles.

Additionally I pinned the ec2-workerpool-autoscaler module reference to the latest release (as it was pulling main which is not ideal). edit: I now realize this can be passed in as a variable.

Type of change

• Bug fix (non-breaking change that fixes an issue);
• New feature (non-breaking change that adds functionality);
• Breaking change (fix or feature that would cause existing functionality to not work as expected);
• Documentation (a documentation or example fix not affecting the infrastructure managed by this module);

Checklists

Development

• All necessary variables have been defined, with defaults if applicable;
• The code is formatted properly;

Code review

• The module version is bumped accordingly;
• Spacelift tests are passing;
• 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;