Shard isolated notebook tests #4192
Merged
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Adds sharding for isolated notebook tests.
These tests only test notebooks against the stable cirq releases. Hence they depend on 4 things: stable cirq release (which does not change), the notebooks, the dev environment and the notebook test itself.
In case the dev environment changes we want to run all the notebooks to ensure everything is still running. However this can take a long time and has been causing issues already on PRs causing timeout in Github Actions.
Sharding the tests to 4 partitions avoids the timeout. This PR also adds the ability to easily modify the number of partitions from the ci.yml directly.
Fixes #4190.