Do not set auto-merge to true by default

Fixes issue introduced by https://gitlab.com/dependabot-gitlab/dependabot/-/merge_requests/1617 by evaluating auto-merge option as true always

This MR also updates an old bug in how auto-merge configuration is created and requires syncing configuration object again.

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Allure report

allure-report-publisher generated test report!

rspec: ✅ test report for da98d17d

+------------------------------------------------------------------+
|                        behaviors summary                         |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| services    | 173    | 0      | 0       | 0     | 173   | ✅     |
| jobs        | 14     | 0      | 0       | 0     | 14    | ✅     |
| controllers | 25     | 0      | 0       | 0     | 25    | ✅     |
| tasks       | 8      | 0      | 0       | 0     | 8     | ✅     |
| models      | 3      | 0      | 0       | 0     | 3     | ✅     |
| system      | 10     | 0      | 0       | 0     | 10    | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 233    | 0      | 0       | 0     | 233   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+