Migrates unit tests to use RoslynCodeTaskFactory to enable running tests under .NET Core

[jankratochvilcz]

Fixes #248

Context

I'm trying to migrate the tests so we can run them on .NET Core as indicated in the task.
Doing a small first batch first to catch any concerns and understand repo mechanics, will do a bigger volume in a follow-up PR.

Changes Made

• Rewrite to using RoslynCodeTaskFactory for tests where the SUT is not CodeTaskFactory but the factory is part of the test setup.
• Minor stylistic changes
• Removing ignored tests (see comment to discuss)

Testing

Tests should be passing for both Framework and Core flavors.

Notes

[Copilot]

Pull request overview

This PR migrates a first batch of unit tests away from CodeTaskFactory to RoslynCodeTaskFactory to enable running the tests under .NET Core, aligning with the repo direction described in #248.

Changes:

• Updated several inline-task-based test projects to use RoslynCodeTaskFactory instead of CodeTaskFactory.
• Removed FEATURE_CODETASKFACTORY compilation guards around the updated tests so they run in more configurations.
• Deleted a couple of previously skipped legacy inline-task tests (that relied on older task assemblies / behavior).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Build.UnitTests/BackEnd/TaskHost_Tests.cs	Switches inline tasks in “log after task is done” tests to RoslynCodeTaskFactory and modernizes the embedded project XML.
src/Build.UnitTests/BackEnd/TaskBuilder_Tests.cs	Updates the null-metadata inline-task test to RoslynCodeTaskFactory, adjusts test naming/comment text, and removes skipped legacy inline-task tests.

[jankratochvilcz]

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