resource/gitlab_service_jira: several cleanup of tech debt

Timo Furrerrequested to merge
github/fork/timofurrer/cleanup/jira-id into main

This change set cleans up a few things in the gitlab_service_jira resource:

  • properly use resource ID in read function
  • use passthrough importer
  • state in docs that jira_issue_transition_id attribute cannot be imported
  • add import verification test steps to _basic test and remove dedicated _import test

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