Delete legacy test code (#3829)

Summary:
Change-Id: Id8c62d2c598d06a39c778dc3849625bd49aedc0d

Pull Request resolved: #3829

Reviewed By: mergennachin

Differential Revision: D58138120

Pulled By: digantdesai

fbshipit-source-id: ec9791db649524cc7cdb447554d774169c660ac7

.github/workflows/trunk.yml

@@ -173,8 +173,8 @@ jobs:
 
         install_arm
 
-        # Test tosa_reference flow
-        PYTHON_EXECUTABLE=python bash backends/arm/test/run_tosa_reference.sh
+        # Run arm unit tests
+        pytest -c /dev/null -v -n auto --cov=./ --cov-report=xml backends/arm/test
 
   test-coreml-delegate:
     name: test-coreml-delegate

backends/arm/README.md

@@ -32,17 +32,15 @@ Other:
 - `test/` - Unit test and test support functions
 
 ## Unit tests
-We're currently transitioning to use the generic Tester class.
+This is the structure of the test directory
 
 ```
 test                            #  Root test folder
 ├── models                      #  Full model tests
 ├── ops                         #  Single op tests
 ├── tester                      #  Arm Tester class
 ├── tosautil                    #  Utility functions for TOSA artifacts
-├ arm_tosa_reference.py         #  Legacy test runner. Keep until all tests are ported to new test structure.
-├ test_models.py                #  Legacy test definitions. Port these tests to new test structure.
-├ test_tosa.py                  #  Legacy unit test. Keep until tests are ported to new test structure.
+├ common.py                     #  Common functions and definitions used by many tests
 ```
 
 Some example commands to run these tests follow. Run a single test: