Do not install editable NNCF in workflows

[vshampor]

Changes

Now doing pip install . instead of pip install -e . in GH Actions workflow files.

Reason for changes

Ubuntu 22 and pip/setuptools have a lot of bugs when installing editable packages with the new build isolation flow (e.g. when the pyproject.toml is present). We don't have pyproject.toml yet, but should we need to switch, better to have less failures in the unrelated tests and workflows - we don't really need editability in GH actions we have now.

Related tickets

N/A

Tests

Can only test changes in these workflows post-factum.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@8b71d39). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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