feat: Add env file for CPU, GPU, and mixed configurations for the efficientnet pipeline

[brian-intel]

PR Checklist

• [ ] Added label to the Pull Request for easier discoverability and search
• [ ] Commit Message meets guidelines as indicated in the URL https://github.com/intel-retail/automated-self-checkout/blob/main/CONTRIBUTING.md
• [ ] Every commit is a single defect fix and does not mix feature addition or changes
• [ ] Unit Tests have been added for new changes
• [ ] Updated Documentation as relevant to the changes
• [ ] All commented code has been removed
• [ ] If you've added a dependency, you've ensured license is compatible with repository license and clearly outlined the added dependency.
• [ ] PR change contains code related to security
• [ ] PR introduces changes that breaks compatibility with other modules (If YES, please provide details below)

What are you changing?

Added additional environment files to handle mixed CPU + GPU configurations for the efficientnet pipeline.

Issue this PR will close

close: #issue_number

Anything the reviewer should know when reviewing this PR?

Test Instructions if applicable

If the there are associated PRs in other repositories, please link them here (i.e. intel-retail/automated-self-checkout )