testfx: MSTest 3.0.0 is broken when targeting .NET Framework 4.8

Describe the bug

Steps To Reproduce

1. Create UnitTest project in Visual Studio 2022.
2. Make sure target framework is .NET Framework 4.8.
3. Build and execute unit tests.

Expected behavior

Tests execute.

Actual behavior

Tests do not execute.

Additional context

See attached sample project TestProject1.zip.

Tests output:

Log level is set to Informational (Default).
Connected to test environment '< Local Windows Environment >'
Source code repository not available. Some features may not work as expected.
Test data store opened in 0.038 sec.
Downloaded solution cache containers in 0.112 sec.
Loaded 0 test records from 0 solution cache containers in 0.279 sec.
========== Starting test discovery ==========
========== Test discovery finished: 1 Tests found in 3.6 sec ==========
Test data store opened in 0.016 sec.
========== Starting test discovery ==========
========== Test discovery skipped: All test containers are up to date ==========
Building Test Projects
========== Starting test run ==========
An exception occurred while invoking executor 'executor://mstestadapter/v2': Could not load file or assembly 'Microsoft.VisualStudio.TestPlatform.TestFramework.Extensions, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
Stack trace:
   at Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices.TestDeployment.GetDeploymentInformation(String source)
   at Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.Execution.TestExecutionManager.ExecuteTestsInSource(IEnumerable`1 tests, IRunContext runContext, IFrameworkHandle frameworkHandle, String source, Boolean isDeploymentDone)
   at Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.Execution.TestExecutionManager.ExecuteTests(IEnumerable`1 tests, IRunContext runContext, IFrameworkHandle frameworkHandle, Boolean isDeploymentDone)
   at Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.Execution.TestExecutionManager.RunTests(IEnumerable`1 tests, IRunContext runContext, IFrameworkHandle frameworkHandle, TestRunCancellationToken runCancellationToken)
   at Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.MSTestExecutor.RunTests(IEnumerable`1 tests, IRunContext runContext, IFrameworkHandle frameworkHandle)
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.RunTestsWithTests.InvokeExecutor(LazyExtension`2 executor, Tuple`2 executorUri, RunContext runContext, IFrameworkHandle frameworkHandle)
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.<>c__DisplayClass46_0.<RunTestInternalWithExecutors>b__0()
   at Microsoft.VisualStudio.TestPlatform.PlatformAbstractions.PlatformThread.<>c__DisplayClass0_0.<Run>b__0()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.VisualStudio.TestPlatform.PlatformAbstractions.PlatformThread.Run(Action action, PlatformApartmentState apartmentState, Boolean waitForCompletion)
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.TryToRunInStaThread(Action action, Boolean waitForCompletion)
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.RunTestInternalWithExecutors(IEnumerable`1 executorUriExtensionMap, Int64 totalTests)

========== Test run finished: 0 Tests (0 Passed, 0 Failed, 0 Skipped) run in 217 ms ==========

AB#1696392