Generating log artefacts for gitlab-ctl reconfigure command

What does this MR do and why?

The MR generates logs for gitlab-ctl reconfigure command and attaches it as artefacts in the CI pipeline for UpdateFromPrevious tests.

This change would in-turn add gitlab-ctl reconfigure logs as artefacts for update-major and update-minor test job.

The MR also adds some more logging which tells when the test fails due to gitlab-ctl reconfigure command failing, amongst other logging.

Related to issue: gitlab-org/quality/quality-engineering/team-tasks#2070 (closed)

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