Fix the problem of `project-template-check`

What does this MR do and why?

Related to https://jihulab.com/gitlab-cn/gitlab/-/issues/1788

Follow up !1085 (merged), fixed these problems:

1. Setup DB environment, solve the problem in https://jihulab.com/gitlab-cn/gitlab/-/jobs/5161007
2. Job not failed when there already exists a related issue.
3. Disable WebMock in the pipeline environment
4. Fix the templates list logic, solve the problem in https://jihulab.com/gitlab-cn/gitlab/-/issues/2141#note_1508692
5. Fix the HTTP Client problem:

   # Wrong
   jihulab_client.get(..., params: {...})
   jihulab_client.post(..., data: {...})
   
   # Correct
   jihulab_client.get(..., query: {...})
   jihulab_client.post(..., body: "...")

Screenshots or screen recordings

Before	After

How to set up and validate locally

JH_PROJECT_TEMPLATE_ENDPOINT=xxx JIHU_REPORTER_TOKEN=xxx JH_PROJECT_TEMPLATE_ASSIGNEE_IDS=xxx bin/rake jh:project_template_check:run