Allow Release Tools bot to retry failed Gitaly pipelines
## Context This is a follow-up to https://gitlab.com/gitlab-org/gitaly/-/issues/6143#note_1987927818, to further reduce the amount of manual intervention required on part of the Gitaly team. ## Proposal Allow the [Release Tools bot](https://gitlab.com/gitlab-org/release-tools) to retry failed pipelines in [Update Gitaly version](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/152579) MRs. Failed pipelines are typically caused by flakey tests outside of the purview of the Gitaly team. Retrying up to 3 times feels reasonable. It would be great if the bot can retry the _specific failed job_ rather than running the entire pipeline from scratch.
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