Fix tests for 2.10 release

Please check if the PR fulfills these requirements
[ ] The commit message follows our guidelines
[ ] Tests for the changes have been added (for bug fixes/features)
[ ] Docs have been added / updated (for bug fixes / features)
What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Test fix
What is the current behavior? (You can also link to an open issue here)
1. We don't have no-model end-to-end tests
1. PY-Marqo tries to decode it as JSON and gets an error when the response isn't JSON
1. Version check tests are not working properly
What is the new behavior (if this is a feature change)?
1. Add no-model end-to-end tests
1. Fix a bug where PY-Marqo tries to decode it as JSON and gets an error when the response isn't JSON
1. Fix a bug where version check tests are not working properly
Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
Other information:

marqo-ai / py-marqo