Python: Moved the tests folder to be under the root folder

[barshaul]

Move tests/ (and conftest.py) to the top-level python/ directory, alongside pytest.ini, in order to enable running tests from the root python folder with the conftest arguments.
Current struct:

python/
├── pytest.ini
└── python/
    ├── glide/
    └── tests/
        └── conftest.py

Refactored struct:

python/
├── pytest.ini
├── tests/
    ├── conftest.py
└── python/
    ├── glide/

Issue link

This Pull Request is linked to issue (URL): #3663

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one issue.
• Commit message has a detailed description of what changed and why.
• Tests are added or updated.
• CHANGELOG.md and documentation files are updated.
• Destination branch is correct - main or release
• Create merge commit if merging release branch into main, squash otherwise.

[shohamazon]

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