ci: Also look at jh/ directory for potential changes

What does this MR do?

Also look at jh/ directory for potential changes

We don't need this in EE, but we need this in JH: https://gitlab.com/gitlab-jh/gitlab

This is the easy way to enable it, because CI configurations are not very extensible.

This should have no effects in EE nor FOSS, because the directory does not exist.

This is a part of gitlab-jh/gitlab#44 (closed)

@alberts-gitlab Please review? Thanks! /cc @gl-quality/eng-prod @qianzhangxa

(I want to include this into 13.2 for JH, but we don't need to pick this as it has no effects anyway)

Conformity

• I have included a changelog entry, or it's not needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.