pytest: Fix tests execution with pytest 8.1

Remove use of --import-mode=importlib pytest option and use new option consider_namespace_packages to fix tests execution with latest pytest release.

Jenkins job DLDSVN/gitlab-builds #173 succeeded .
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• 461e0361 - pytest: Fix tests execution with pytest 8.1

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Jenkins job DLDSVN/gitlab-builds #174 succeeded .
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merged