Support migrating Zephyr v5

When executing the migration tool we get this exception:

java.util.concurrent.CompletionException: java.lang.IllegalStateException: Incorrect usage of JIRA/lucene search API. You can only create/use: ManagedIndexSearcher inside a context (request or Jira-Thread-Local). Check: JiraThreadLocalUtils for details.
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
(...)

This is happens on Jira8. May be caused by the fact that we use Lucene to get some information but the whole migration process is executed in a parallel thread, for instance the total of Zephyr tests to migrate. The JQL search seems to have problems when running in parallel threads. Some search let me find three solutions: