Remove MEP tests results. Move tests from Hypar.Tests namespace.

[DmytroMuravskyi]

BACKGROUND:

• When working with Elements after MEP was moved inside, I noticed that after each run of unit tests I have a lot of modified files, detected by git from test results folder.
• I also noticed that several files use Hypar.Test namespace while all other starts with Elements namespace.

DESCRIPTION:

• Removed MEP test results from repo by deleting existing results and renaming result folder to "RestResults" that is ignored due to a rule inside gitignore.
• Used Elements.Geometry.Tests instead oh Hypar.Tests in 6 files where it was used, so everything looks standardized.

TESTING:

• No new tests added.

REQUIRED:

• All changes are up to date in CHANGELOG.md. Nothing is added to CHANGELOG since changes don't affect any logic.

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This change is