Removed the default registration of the IHelpProvider

[nils-a]

fixes #1313

• I have read the Contribution Guidelines
• I have commented on the issue above and discussed the intended changes
• A maintainer has signed off on the changes and the issue was assigned to me
• All newly added code is adequately covered by tests
• All existing tests are still running without errors
• The documentation was modified to reflect the changes OR no documentation changes are required.

Changes

This was a bit more complicated than I expected:
After implementing the changes discussed in #1313 (comment) some of our own tests failed because the FakeTypeRegistrar/FakeTypeResolver did not adhere to our assumptions.

Thus, I created a unit test that covers the FakeTypeRegistrar using the TypeRegistrarBaseTests and resolved all issues accordingly.
Also, there was a minor issue in the ComponentRegistry that arose when mixing Register, RegisterInstance and RegisterLazy - not sure if mixing Register with RegisterInstance while using the same interface is an issue that will occur in the "real world", but it's fixed now 😄
Also there was something going on with line endings in CommandExecutor, not sure why that was so.

[patriksvensson]

LGTM 👍

[FrankRay78]

Nice PR @nils-a