🔨 Added Tests for POT and NNCF Compression Types

[sky0walker99]

📝 Description

-This PR addresses the missing tests for the POT (Post-Training Optimization Tool) and NNCF (Neural Network Compression Framework) features in Engine.export. This PR adds unit tests to verify the export functionality with these compression types.

• Ensures compression_type is used only with OPENVINO export type, raising an error if violated in Engine.export

• Added tests in test_cli to cover all compression type combinations.

• attributes POT (Post-Training Optimization) and NNCF (Neural Network Compression Framework) to the CompressionType

• 🛠️ Fixes [Task]: Add unit tests for Engine.export #2273

✨ Changes

Select what type of change your PR is:

• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🔨 Refactor (non-breaking change which refactors the code base)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔒 Security update

✅ Checklist

Before you submit your pull request, please make sure you have completed the following steps:

• 📋 I have summarized my changes in the CHANGELOG and followed the guidelines for my type of change (skip for minor changes, documentation updates, and test enhancements).
• 📚 I have made the necessary updates to the documentation (if applicable).
• 🧪 I have written tests that support my changes and prove that my fix is effective or my feature works (if applicable).

For more information about code review checklists, see the Code Review Checklist.

[samet-akcay]

@ashwinvaidya17, will you be able to review this?

[ashwinvaidya17]

Thanks for the PR, I've added a few comments

[ashwinvaidya17]

Thanks

[sky0walker99]

@samet-akcay is there anything to be done in this pr ?