E2E test: run gdk tests with gitaly transactions for Gitaly version changes

What does this MR do and why?

Resolves gitlab-org/quality/quality-engineering/team-tasks#3041 (comment 2140498134)

• Runs the gdk tests with gitaly transactions enabled when there is a change to the gitaly version
• The tests run in parallel to the gdq-qa-blocking tests and they are also blocking. They don't run in scheduled pipelines.
• Small adjustment to how we start gdk, so we have the logs for gdk start

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

Pipeline only change

Example pipelines

• The tests not running in this pipeline (as there is not gitaly version change) https://gitlab.com/gitlab-org/gitlab/-/pipelines/1478153925
• The tests running in this draft MR with a change to the gitaly version file: (parent pipeline) !167866 (closed) -> (gdk child pipeline) https://gitlab.com/gitlab-org/gitlab/-/pipelines/1479522921

Example log

We can see that transactions are enabled from this message:

2024-10-02_06:39:23.38177 [35mgitaly                : [0m{"level":"warning","msg":"Transactions enabled. Transactions are an experimental feature. The feature is not production ready yet and might lead to various issues including data loss.","pid":4550,"time":"2024-10-02T06:39:23.381Z"}

Which is present in https://gitlab.com/gitlab-org/gitlab/-/jobs/7971595467/artifacts/external_file/gdk.gitaly.log (transactions enabled) and absent in https://gitlab.com/gitlab-org/gitlab/-/jobs/7971595417/artifacts/external_file/gdk.gitaly.log (default config)