Run cuvs-bench pytests and end-to-end tests in CI

[dantegd]

PR does the following:

• Modifies CI to run pytest and e2e test of cuvs-bench
  • We need to test the additional time needed to run the tests. They should be fast, but if they are not, then we can add an additional job to run them in parallel.
• Adds synthetic test-data generation so the CI jobs don't depend on downloading datasets, and users can have easy testing locally.
  • Few improvements to be done to docs, yaml and other things to make it easy for users.
• Check in some additional pytests that hadn't been checked in before.

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