Consider dividing integration tests into two groups.

[deflaux]

The integration tests currently take 32 minutes to complete. Of that:

• 8 minutes for the tests that run locally on tiny data
• 24 minutes for the tests that run on the cloud on the same tiny data and also some more complex tests such as the sharded bam writing test

We could divide these tests into two groups perhaps using maven profiles to invoke them with separate exclude rules:

• mvn clean install would run the "fast" integration tests
• mvn clean install -P exhaustive would run all the integration tests