Correctly handle archived projects

Improves handling of archived projects:

• Do not allow to register already archived project
• Skip automatic registration when project is archived
• Remove update jobs for archived projects automatically if "automatic" registration is enabled
• Refactor automatic registration logic and general code improvements

Closes: https://gitlab.com/dependabot-gitlab/dependabot/-/issues/263

---

Allure report

allure-report-publisher generated test report!

rspec: ✅ test report for 9296d51f

+------------------------------------------------------------------+
|                        behaviors summary                         |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| jobs        | 14     | 0      | 0       | 0     | 14    | ✅     |
| services    | 177    | 0      | 0       | 0     | 177   | ✅     |
| controllers | 25     | 0      | 0       | 0     | 25    | ✅     |
| models      | 4      | 0      | 0       | 0     | 4     | ✅     |
| system      | 10     | 0      | 0       | 0     | 10    | ✅     |
| tasks       | 9      | 0      | 0       | 0     | 9     | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 239    | 0      | 0       | 0     | 239   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+