Do not restrict on CI_PROJECT_PATH for Gitaly test

What does this MR do and why?

Do not restrict on CI_PROJECT_PATH for Gitaly test

CI_PROJECT_PATH should be set as the path where it's running the pipeline, and in the case of Gitaly triggering a cross project pipeline, it is gitlab-org/gitlab rather than gitlab-org/gitaly.

That said, checking the variable doesn't really make sense, because it's likely the pipeline wouldn't really run if anything else than gitlab-org/gitlab is set. This variable is used in a lot of places, changing it will likely to break random things, so it should be just assumed and it should not be changed.

Also CI_PIPELINE_SOURCE should be pipeline for cross project pipelines.

How to validate

This is tested in gitaly!6617 (merged)

• Triggered Rails pipeline: https://gitlab.com/gitlab-org/gitlab/-/pipelines/1139610933