Add yarn install before jh gettext rake

What does this MR do and why?

Related MR: !900 (merged)

Related pipeline: https://jihulab.com/gitlab-cn/gitlab/-/pipelines/1312331

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/8175059

How to reproduce:

• Clear runner caches: https://jihulab.com/gitlab-cn/gitlab/-/pipelines
• Trigger a new scheduled pipeline: https://jihulab.com/gitlab-cn/gitlab/-/pipeline_schedules

static-analysis-jh failed due to Cannot find module 'commander'.

static-analysis-jh job should not depend on cache to work, so add the step of yarn install.

Screenshots or screen recordings

Non-UI

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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