Update create_personal_snippet_spec.rb, remove smoke test tag

What does this MR do?

Removes a test from the smoke test suite. This should unblock gitlab-com/gl-infra/production#4121 (closed)

There was an attempt at fixing this at !57997 (merged) but it looks like create_project_snippet_spec uses the blob viewer, so this fix needs to be more involved.

Screenshots (strongly suggested)

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