Bump ubuntu 22.04 + fix CI mlflow tests

[KuuCi]

What does this PR do?

Bump to Ubuntu 22.04, 20.04 will be EOLed in 5 months. Main caveat is that Ubuntu 22.04 apt installs blinker, which cannot be pip uninstalled, meaning that build will error when composer tries to update the version, so we need to apt uninstall and install via pip.

Also Mlflow changed how they default their tracking_uri, so fix for that here where we just manually set the properly tracking_uri in test fixtures

What issue(s) does this change relate to?

https://databricks.atlassian.net/browse/GRT-3195

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