Remove ci_repeated_commands_builds metric

Ahmad Sherifrequested to merge
remove-ci-repeated-commands-metric into master

The column ci_builds.commands has been removed from Rails and has been deprecated for long before that, thus this metric is no longer functioning.

Related to gitlab-org/gitlab!54564 (merged)

Fixes https://gitlab.com/gitlab-org/gitlab-exporter/-/issues/77

Merge request reports