Add instructions in the pipeline editor for configuring jobs for merge requests

Summary

A user reported difficulty understanding that they need to configure jobs for merge requests in their new GitLab project. To improve clarity, adding clear instructions in the pipeline editor would help guide users to set up MR workflow effectively.

👉 Actionable insight: Dovetail

Implementation Details

• Add the necessary text/link to the secondParagraph string in getting_started_section.vue.
• Add a #link template to the <gl-sprintf> portion of the template
• Update getting_started_section_spec.js to include a section to test secondParagraph - especially the link

Definition of Done

• Instructions are added in the pipeline editor to guide users on configuring jobs for MRs.
• Unit tests are updated
• A docs link to the relevant GitLab documentation is included in the instructions. (https://docs.gitlab.com/ee/ci/pipelines/merge_request_pipelines.html#add-jobs-to-merge-request-pipelines)

Details

Design spec

• Figma dev 🔗
• Design tab 👉

Roles involved

• Design
• Technical Writing
• Backend
• Frontend
• Test engineering

NOTE: When work is ready to be defined, please create appropriate sub-tasks.