Change pipeline empty state language [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

This cleans up the pipelines empty state MVC experiment, which was just testing a language change on the pipelines page when its empty.

Cleanup Issue: #300397 (closed)

Initial MR that gets cleaned up: !47952 (merged)

How to test

• Create or go to a project without a .gitlab-ci.yml file
• Disabled "Default to Auto DevOps pipeline" in the CI/CD settings of your project (http://localhost:3000/<group_name>/<project_name>/-/settings/ci_cd
• Go to CI/CD -> Pipelines (http://localhost:3000/<group_name>/<project_name>/-/pipelines
• You will see the new language

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team