test: Add end-to-end tests for select models in FX2TRT

[gs-olive]

Description

• Designed to reflect test_models.py which evaluates the TorchScript path on a few key models, test_compile_e2e.py tests the ease-of-compilation using fx2trt by porting over the test cases and using "ir=fx"
• Evaluate functionality using cosine similarity metric
• Small fix in failing test within dispatch tracer
• Enable all tracer tests in noxfile
• BERT/Transformer tests to come

Fixes #1634

Type of change

• Improved testing coverage

Checklist:

• [ x ] My code follows the style guidelines of this project (You can use the linters)
• [ x ] I have performed a self-review of my own code
• [ x ] I have commented my code, particularly in hard-to-understand areas and hacks
• [ x ] I have made corresponding changes to the documentation
• [ x ] I have added tests to verify my fix or my feature
• [ x ] New and existing unit tests pass locally with my changes
• [ x ] I have added the relevant labels to my PR in so that relevant reviewers are notified