Plugin System upgrade tasks should not be run before JIRA's own upgrade tasks are run

One of our plugin upgrade tasks needs to create a new user group. But it fails with a message:

com.atlassian.crowd.exception.runtime.OperationFailedException: No Crowd Application available.

This is because the 'embedded_crowd' application is not found.

After reading the log, it turns out that the 'embedded_crowd' application is added by JIRA's own upgrade task 601, which is run after the plugin upgrade tasks are run.

The PluginUpgradeManager listens to JiraStartedEvent, which is fired at the end of ComponentManager.quickStart(), which is part of the ConsistencyLauncher, which runs before UpgradeLauncher that runs JIRA's own upgrade tasks.